Heat Holders® invented The Warmest Thermal Sock and is celebrating its 10th Anniversary this year. The brand has since expanded product assortment to offer accessories, thermal underwear etc. Heat Holders® Original sock is 7x warmer than a regular cotton sock and 3x warmer than regular thermal socks. Test results prove that they are the Warmest Thermal Socks. They are a natural gifting choice for 4th quarter and holiday season and perfect for warmth and comfort through the winter season.