Is designed to elevate skin temperature and increase circulation which can provide temporary pain relief from diabetic Neuropathy Raynard's Disease and arthritic conditions in the foot and ankle. Non-slip Safety SoleTM rubber grip bottom helps prevent slipping. This item is a single boot that can be worn on either foot. Sized by shoe size. Available in size X-Small - X-Large. SIZE: X- Small: Mens 3-5 Womens 4-6, Small: Mens 6-7 Womens 7-9, Medium: Mens 8-10 Womens 10-11, Large: Mens 11-12 Womens 12-13, X- Large: Mens 13-14 Womens 14-15.