Performance Evaluation of Western Saddle Pads
- Apr 8, 2007
The local tack shop has them in all shapes, sizes, and colors, and they are an essential part of every horse's tack--the saddle pad. Lately, interest in the equine industry has lead to an increase in the manufacturing of technologically advanced saddle pads, often at a higher price. But what makes a good saddle pad? Although there has been little research conducted to measure the performance of these high-tech pads, there is a growing interest in providing more information to consumers regarding the purpose of saddle pads and the materials used in them. Nevertheless, as anyone who has purchased a saddle pad recently knows, the endless combination of materials used in pads today makes purchasing one extremely confusing, especially when each manufacturer claims his is the best. But which pads are "the best" and what does "the best" mean?
The primary purpose of a saddle pad is to facilitate riding comfort for the horse. It does this by easing the connection between the horse's back and the hard surface of the saddle. A pad can ease minor fit problems by acting as a space filler, evenly distributing pressure and eliminating high-pressure points underneath the saddle. It can also pull moisture away from the horse's back, anchor the saddle, and protect it from sweat and dirt. However, saddle pads are not designed to fix major saddle fitting problems and should not be used as the solution to an ill-fitting saddle.
Why Study Saddle Pads?
The ridden horse experiences repetitive patterns of pressure that increase in severity with increases in speed, weight and instability of the rider, and ill fit of the saddle. These pressures in addition to sweat and shifting can lead to bruising, scalding, breakage of hairs, high-pressure points, pressure sores, decreased performance of the horse, and interrupted communication between the horse and rider.
Pressure sores are one example of the damage that can occur under the saddle pad. Pressure sores are caused by pressure, shearing forces (sliding of two opposing surfaces against each other), friction, and moisture. Many times, pressure sores are only visible on the surface once permanent internal damage has already occurred (Todd & Thacker, 1994). Therefore, it is important to choose a saddle pad that fits with the saddle you will be using, and works to eliminate these problems before they cause damage. Therefore, a saddle pad should provide the following performance characteristics:
- Cushioning and shock absorption, evenly distributing pressures and eliminating high pressure points;
- Heat and moisture transport from the horse's skin to the environment while protecting the saddle from sweat;
- Proper fit of the horse and saddle, preventing pad shifting and gaping (acting as a space filler);
This study evaluated the cushioning and moisture characteristics of six different types of western saddle pads before and after use. We evaluated the pressure distribution, compression resistance and recovery, as well as the liquid wicking rate. The measurement of these variables before and after use allowed us to evaluate the durability of the pads (i.e., the pads' ability to maintain their original performance characteristics after use).
Four different premium-priced ($130 or more) Western saddle pads were selected for testing as well as two lower-priced pads for comparison. These pads are shown in Table 1. The technologically advanced materials used in these pads are described below.
Closed-cell vs. open-cell foam Foams are classified as either closed-cell or open-cell, which refers to the structure of the material. Both structures are characterized as being predominantly made of air. Open-cell foam contains open air spaces that are connected to each other and form an interconnected network. Closed-cell foam is made of air bubbles enclosed by a solid or liquid material, but these cells are not always all completely enclosed as some of them might have burst during formation.
The foam used in both the SMx Air-Ride Western Show Pad and the Wrangler SMx H.D. Air-Ride Saddle Pad is a closed-cell composite foam that is formed by fusing closed-cell polymer beads at their tangent points. This produces a foam composite that allows fluids such as air and water to flow freely through the material. When force is applied to the foam, the beads act upon one another to laterally disperse energy (Brock, n.d.).
The ESP Extra Sensory Protection pad, on the other hand, uses open-cell viscoelastic polyurethane Memory Foam as its core. Viscoelastic materials are those that have both viscous (referring to the liquidity of a material) and elastic (ability to recovery to original dimensions after deformation) properties. This material actually experiences a change in molecular composition when under compaction due to its viscosity (acting somewhat like a liquid, allowing it to mold around objects). But, it is able to fully recover (after a period of time) because of its elastic property. Additionally, because the material is heat sensitive, it molds better in the presence of body heat.
The Pro-Ride saddle pad uses a 0.75 in. 1.2 lb/ft3 density Neoprene. Neoprene is the trade name for a family of synthetic rubbers made with polychloroprene. Neoprene foam is available as both closed-cell and open-cell materials and is used in applications ranging from wetsuits to noise insulation.
Gel The Impact Gel Close Contact Contour Pad uses a gel for its core. Gels have characteristics of both a liquid and a solid. For example, the gel in the Impact Gel did not run like a liquid when it was cut, but when enough pressure was applied to the sample, the gel deformed and oozed slightly out of the sides of the sample. Gels are most widely recognized for their use as shoe inserts and are known for their shock absorbing capabilities.
Fleece vs. felt The terms fleece and felt both refer to fabric structures and both can be made with manufactured and/or natural fibers. Fleece is a soft, bulky fabric made with a pile (upright ends of the fibers protruding from the fabric). Felt is created when heat, moisture, and pressure are applied to a mass of fibers causing them to become entangled, forming a felted fabric. The Reinsman uses an acrylic/polyester blend fleece liner and the SMx Air-Ride pad uses a merino wool fleece liner--a very fine, soft wool from Merino sheep. All other pads tested used either a wool or wool blend felt as their liner or top.
All of the tests were conducted on the new saddle pads before they were used. The pads were then sent to an equine training facility where they were ridden vigorously for 200 hours. All pads were then returned to Kansas State University to be re-evaluated using the same tests in order to evaluate their durability.
Pressure distribution The Force Sensing Array (FSA) pressure mapping system made of a pressure mat containing 256 pressure sensors was used to evaluate the pressure distribution of the pads. The FSA system was developed by Vision Engineering Research Group (VERG Inc.) of Winnipeg, Manitoba, Canada. The mat was placed on a horse under a saddle and rider, and the pads were tested for 30 seconds at three different gaits--walk, jog, and lope. The mat communicated with a computer to create a scan of the pressures measured underneath the saddle pad. A still image of this pressure scan is shown in Figure 1 at right. We used the data collected and a video of the horse and rider to create what we called the dynamic compilation video (Figure 2, at right). A key of the pressures corresponding to each color in the compilation video is provided in Figure 3 at right.
The compilation videos were used to determine the most appropriate way to statistically analyze the pressure data. We used the average peak pressure to represent the highest pressure measured under the pad, and the standard deviation to indicate how evenly the pressures were distributed on the horse's back. It was our assumption that the ideal saddle pad would have a more even distribution of pressure (i.e., low standard deviation) and low peak pressure.
Compression resistance and recovery Compression resistance is a material's ability to resist change in dimension while under a heavy load. Compression recovery is a material's ability to recover to its original dimensions after the load is removed. The ideal level of these variables is unknown in a saddle pad application; however, they are crucial factors in shock absorption. These variables were measured using a deadweight compression system where a 3 inch by 6 inch sample of each pad was placed on a platform and compressed under a load equivalent to the highest peak pressure measured with the FSA system. The samples were then allowed to recover from compression for eight hours.
Wicking Saddle pads are designed to protect the saddle from getting wet. Therefore they block the movement of moisture through the saddle pad, reducing the evaporation of sweat from the horse's back. Consequently, much of the sweat produced remains in the liquid state. Liquid moisture can be transferred along the surface of the saddle pad liner via wicking--the spontaneous flow of liquid in a porous substrate (e.g., fabric) as a result of wetting (Kissa, 1996). The movement of liquid moisture through a textile is dependent upon whether the material is hydrophilic or hydrophobic. A hydrophobic fiber will repel liquid, while a hydrophilic fiber will attract liquid, allowing it to wick or move along the surface. The liquid wicking rate of each sample was measured by hanging a 10 inch by 3 inch sample 0.5 inches under water and measuring the distance the water traveled up the sample after one hour of submersion. It was our assumption that the ideal saddle pad would have a high wicking rate, which would mean it has a better ability to pull liquid off of the horse's body and spread it along the surface of the lining fabric.
Which Pad Performed Best?
It is difficult to determine which pad is "the best" because pads provide different levels of performance on different variables. Therefore, we need to prioritize which characteristics are the most important in maintaining the health and comfort of the horse.
Pressure distribution The Force Sensing Array (FSA) analysis provided the most important and meaningful information in the evaluation of the saddle pads. This is because peak pressures felt by the horse can cause the most potential damage under the saddle pad during riding.
We cannot assume that the pads in this study that exhibited the highest peak pressures and highest standard deviation are "bad" or harmful to the horse, because the level of pressure that will potentially injure a horse is not known. The pads that gave the poorest performance are only less desirable in comparison to the other pads tested.
Before use, the SMx Air-Ride and ESP Memory Foam saddle pads performed significantly better than the Pro-Ride Neoprene saddle pad, as they were better able to reduce the peak pressures. The Pro-Ride Neoprene pad exhibited the highest peak pressure and standard deviation of all pads. The SMx Air-Ride and ESP Memory Foam, as well as the Reinsman pads were better able to evenly distribute the pressures under the saddle, as indicated by significantly lower standard deviation values (see Figure 4 at right.)
Professional trainers at the training facility where the pads were ridden refused to ride the Pro-Ride Neoprene saddle pad due to a concern that the center seam construction would impose on the horse's spine. Therefore, only five pads were ridden and evaluated after use.
After 200 hours of use, all ridden pads displayed slightly lower average peak pressures; however, these differences from before to after use were not statistically significant. Nevertheless, this decrease in peak pressure suggests that the saddle pads experienced a period of wear-in before exhibiting their best performance, similar to the wear-in period of a shoe. After use, the Wrangler SMx H.D. Air-Ride, ESP Memory Foam, and SMx Air-Ride pads had significantly lower peak pressures than the Impact Gel saddle pad (also a premium priced pad; see Figure 5 at right). Lower peak pressures indicate superior cushioning performance.
Compression resistance We performed this lab test to determine if the results could be correlated to the FSA system data measured with a horse and rider. Although, there was no overall correlation between the results of the two tests, the findings did suggest that those pads with a high compression resistance might actually be very stiff and not able to conform well to the horse's body, causing high peak pressures on the horse's back. However, it is questionable whether the compression test is able to provide any meaningful predictive results regarding the performance of saddle pads.
Nevertheless, before use results showed that the Wranlger SMx H.D. Air-Ride, Impact Gel, and Pro-Ride Neoprene saddle pads appeared less flexible than the other pads as they had higher resistance to compression. Those pads with high resistance to compression had high recovery because they did not compress that much in the first place so they would be expected to recover the most. On the other hand the ESP Memory Foam pad, after compressing significantly under load, recovered significantly, indicating it's superior resiliency. After use, all pads displayed an increase in resistance to compression, which is most likely due to their decrease in thickness and resultant increase in density (measure of mass per unit volume).
Wicking The ideal saddle pad should have a relatively high wicking rate. Before use, the Reinsman and SMx Air-Ride pads had superior wicking properties compared to all other pads. The Wrangler SMx H.D. Air-Ride and ESP Memory Foam pads had significantly better wicking rates than the Pro-Ride and Impact Gel pads, which did not wick at all.
After use, wicking rates of all pads became more similar, which might be related to the build up of dirt, horsehair, and sweat, and the abrasion of the lining materials of each pad. However, the SMx Air-Ride had a significantly higher wicking rate than all other pads tested after use.
Overall Comparison of Saddle Pads
The reasoning for elimination of the Pro-Ride Neoprene lower priced pad from the durability evaluation of this study was supported by the pressure distribution data collected on this pad before use. This pad exhibited the highest average peak pressure and standard deviation, the highest resistance to compression and consequently, the highest recovery from compression. Additionally, this pad displayed a 0 mm wicking rate.
The Reinsman, also a lower priced pad, seemed to have provided middle-of-the-range performance when compared to other pads tested. Although this pad displayed the highest wicking rate before use, its wicking rate decreased after use. It also had the second-highest peak pressure and standard deviation after use.
Before use, the Impact Gel pad exhibited mid-range performance for average peak pressure and pressure distribution. It also had poor wicking and a high resistance to compression. Even though this pad displayed an increase in wicking rate after use, it gave the highest peak pressures, standard deviation, compression resistance, and compression recovery after use. These results might indicate that the type of gel used in this pad is very stiff. Although we do not know whether the pressure levels measured under this pad are harmful to the horse, this premium-priced pad did not perform as well as the other premium-priced pads.
The SMx Air-Ride (premium-priced) displayed superior performance with the lowest peak pressure and standard deviation before use and significantly lower peak pressure than the Impact Gel after use. This pad also exhibited superior wicking properties both before and after use.
Along with the SMx Air-Ride and ESP Memory Foam pads, the Wrangler SMx H.D. Air-Ride exhibited the best performance in peak pressure elimination and pressure distribution after use. This pad contains a thicker core of the same material found in the SMx Air-Ride. Thus, the fact that there were no significant differences in pressure distribution between these two pads after use suggests that the extra thickness of the core material in the Wrangler SMx H.D. Air-Ride might not be necessary.
Finally, the ESP Memory Foam pad (premium priced) performed as well as the Wrangler SMx H.D. Air-Ride and SMx Air-Ride in pressure distribution testing and gave superior compression resistance and recovery values. However, the compression evaluations revealed that when under load, the Memory Foam component of this pad completely collapsed. It appeared that the materials actually providing the cushioning were the woven wool top and wool felt liner. This suggests that the Memory Foam available in the ESP pad might not be an appropriate or necessary component.
The many types of saddle pads available to consumers today make purchasing a pad difficult. When choosing a pad, consumers should consider several factors, including the price, quality, and durability as they relate to the anticipated level (rigor) and length of use. Consumers should seek advice from a reputable retailer (preferably with riding experience) and search for technical performance information from manufacturers that is based on independent scientific research.
In general, the premium-priced saddle pads evaluated in this study performed better than the lower-priced pads, with one exception. However, all pads remained durable through 200 hours of use and actually improved slightly in performance after their initial use. A consumer who will only be involved in light riding once a week might not require the level of performance from a pad that someone who rides vigorously five times a week needs. Nevertheless, the consumer's first concern should be to protect the horse and provide him with a pain-free riding experience.
About the Authors: Erica D. Wesley, MS in apparel and Textiles; Elizabeth McCullough, PhD in Textile Science; and Steve Eckels, PhD in Mechanical Engineering, all of the Institute for Environmental Research, Kansas State University. Elizabeth Davis, DVM, College of Veterinary Medicine, Kansas State University. This research was sponsored by Professional's Choice Sports Medicine.
The Institute for Environmental Research (IER) at Kansas State University is an interdisciplinary research center for the study of the thermal interaction between people and their environment. Dr. McCullough and her students usually investigate factors affecting the thermal comfort and thermal stress of people wearing protective clothing and sleeping bags. Her graduate student, Erica Wesley, was passionate about horses, so they decided to study the comfort aspects of saddle pads. Dr. McCullough is the Co-Director and Dr. Eckels is the Director of IER.
- Brock Performance Composites. (n.d.). Retrieved July 30, 2006, from www.brockusa.com.htm
- Kissa, E. (1996). Wetting and Wicking. Textile Research Journal, 66(10), 660-668.
- Todd, B.A.; and Thacker, J.G. (1994). Three dimensional computer model of the human buttocks. Journal of Rehabilitation Research and Development, 31(2), 111-119.
About the Author
POLL: Radiographs for Hoof Care