ThinLine is an open-celled foam which moves shock, weight and heat laterally. The material also carries tensile strength so that pressure is evenly distributed. Unlike compression based foams, ThinLine never bottoms out. When warmed to body temperature, ThinLine allows products to mold to the horse's body for a custom fit. ThinLine returns to its original shape at room temperature and will mold again every day for every horse. The lifespan of a ThinLine basic pad is about 7-10 years. All ThinLine products are also infused with active USDA approved anti-fungal and anti-microbial agents rated to last 7-9 years.