Help Prevent Painful Heel Blisters! Open-toed sleeve features hypoallergenic gel-pad cushions to protect heel and achilles area. Low-profile design fits in most dress shoes and sneakers, and latex-free material with bamboo fibers helps relieve pain and improve comfort. Polyester/bamboo charcoal/spandex. Imported. Choose: SM/MD or LG/XL. Due to health and safety concerns, this item is non-returnable.