The Back on Track Exercise Sheet is available in two fabric options: nylon or fleece. Our nylon Exercise Sheet is excellent to use during warm-up sessions and trail riding as well as following exercise or competition. This sheet is breathable and tolerates a degree of water or dampness. Our fleece Exercise Sheet is excellent to use during warm up or cool down, trail riding, or competiton. This sheet is breathable and wicks away sweat. Both Exercise Sheets are made with our Welltex material, which uses your horse's body energy to create a far infrared thermal effect.