Okamoto Hakuraku Socks - Socks to Warm Your Feet and Prevent Heat Loss - Powerful Heat Generation - Thick Cushion Knit - For Home Use - 2 Pairs - Black & Navy 24~26cm Product Description Thoroughly keeps you warm. Warms your feet and prevents heat loss. The moisture-absorbing and heat-generating, heat-retaining material "Warm Wave" thoroughly keeps your feet warm from the ground up. Easy to use everyday Colors: Navy, Black Length: Approximately 15cm Warm Wave is a material developed by Toray Industries, Inc., Toyobo Co., Ltd., and Okamoto Corporation. By mixing the heat-retaining functional fiber "Torcon(R)", the moisture-absorbing and heat-generating fiber "[eks(R)]", acrylic, and wool, it provides comfortable warmth.