The materials used for this product are Neoprene and Terylene. The soft Neoprene provides firm and even support, while also having warming properties that aid in healing and flexibility. Its open patella design is specifically crafted to give additional support for injuries related to the patella. However, individuals with a known susceptibility to dermatitis or allergies to neoprene by-products should not wear this support. It is also not recommended for those with eczema or skin trauma. In case of any abnormalities, please stop using the product immediately and seek medical help. To clean, hand wash in warm water with mild soap and air dry. This product is sold in pairs and is available in sizes Small, Medium, Large, and Extra Large (LxWxH). Small: 14x14x24.5, Medium: 15.5x15.5x24.5, Large: 16.5x16.5x24.5, XLarge