These non-toxic Ice Cells offer a great and easy way to effectively ice your horse's legs after riding. Designed specifically for use with our SMB-II's, they fit securely inside the boots to evenly distribute cold therapy to your horse's leg. They remain flexible while frozen and retain their shape as they melt. Our ice cells are reusable and can be stored in the freezer. They also work great for icing down injuries sustained by the rider.