Back on Track Wrist Cover Size: Large If you work with personal computers or perform repetitive movements with your wrist and hand, or if youve sustained a wrist injury, including the thumb this wrist cover might just be what you need. Our fleece wrist cover provides soothing warmth and support, which may help relieve pain. Weve constructed our Wrist cover with our state-of-the art, ceramic powder-infused Welltex fabric, which works with your natural body warmth to provide a gentle warmth. The ceramic powder reflects your own body warmth as a far infrared wave, a form of energy that has documented pain relieving effect. While wearing the wrist cover the reflected heat may help reduce wrist and thumb tension. SOLD as a PAIR SizeTop/KnuckleLengthBottom/WristSmall 6"7"6"Medium7"7"6"Large8"8"7"XL8"8"7" Material: Lining 100% Polypropylene, Outside: 100% Polyester Color: Black Care: Machine washable up to 86F or 30C. Use normal detergents that do not contain bleach or fabric softeners. Air dry only, do not tumble dry. Back on Track products are not to be compared with magnetic therapy. The effectiveness of Back on Tracks thermal warmth therapy has been established by medical science.