Women's Primrose twist crew sock. Features advanced thermal yarn and more than 7X warmer than a basic cotton sock. Made with specially developed heavy bulk yarn with extreme thermal qualities and a tog rating of 2.34. Features long pile cushioning to help keep feet fully comfortable and supported. The inside of each sock has been intensively brushed for a sensationally soft feeling, and also traps warm air close to the skin keeping your feet warm for a longer time. Non-binding, diabetic friendly, and provide relief for cold feet due to circulation problems.