IOMI / Heat Holders Double Layer Socks for Raynauds IOMI and Heat Holders have collaborated to come up with the Heat Holders socks for people that suffer from Raynaud\'s syndrome. Raynaud?s causes some areas of the body, such as your fingers and toes, to feel numb and cold in response to cold temperatures or other factors. Which in turn, limits blood circulation to the affected areas of the body. These socks are made with Heat Holders double layer, to increase the warmth and keep the heat in. They also have the innovative knitting technology and expert brushing process, that produces a long looped, cushion pile to maximise the amount of warm air being held inside the socks. These socks have a TOG of 3.1, which is 8X warmer than a basic cotton sock (0.33 TOG). Includes non-slip grippers on the bottom of the socks, to provide better traction on indoor wood or tiled surfaces. These socks come in a 1 pair pack and are available in 4 colours. They come in sizes 6-11 UK / 39-45 EU / 7-12 US and 4-8 UK /37-42 EU / 5-8 US. They are made from Main: 89% Acrylic, 8% Polyester, 2% Nylon, 1% Elastane / Lining: 90% Acrylic, 7% Polyester, 3% Elastane and are machine washable. Extra Product Details - Heat Holders - Size 6-11 UK / 39-45 EU / 7-12 US - Size 4-8 UK /37-42 EU / 5-8 US - 1 Pair Pack - Double Layer - 3.1 TOG Rating - Non-Slip Grips - 4 Colours - Main: 89% Acrylic, 8% Polyester, 2% Nylon, 1% Elastane - Lining: 90% Acrylic, 7% Polyester, 3% Elastane - Machine Washable