These non-toxic Ice Cells offer a great way to effectively ice the legs after riding or for therapy. Easy to use, they are designed specifically for use with SMB IIs and fit securely inside the boots to evenly distribute cold therapy to your horses legs. They remain flexible while frozen, retain their shape as they melt, are reusable and can be stored in the freezer. Plus, they are great for icing down injuries sustained by the rider. Sold in pairs.