Terramar Battery Sock

The wool blend Battery Sock ensures all day warmth and comfort. A VelcroA(R) pouch holds the 9V battery and the toes and heel are reinforced for durability. Features Wool blend fabric All over cushioning 9 Volt battery power Chafe-free toe seam 1-Pair Pack Composition 71% Acrylic, 19% Polyester, 10% Wool Small = Men&';s 3-5.5, Ladies 4-6.5,Medium = Men&';s 6-8.5, Ladies 7-9.5,Large = Men&';s 9-12, Ladies 10-13X-Large = Men&';s 12.5-15