This Mid-calf-high waterproof sock is insulated with a liner made of expedition-weight double velour Polartec® Power Stretch™ fleece (7.3 oz. Per square yard). The outside layer is knit of nylon/lycra® spandex offering a durable, flexible, stretch covering. In between the two fabric layers is our waterproof MVT membrane. These three layers are securely bonded together throughout. This combination of materials provides a very soft, comfy, warm, stretch-to-fit sock suitable for a whole host of cold, wet, nasty outdoor conditions. If you are outside in cold weather doing such activities as hunting, ice fishing, skiing, boating, and military service – you will be pleased with SealSkinz® ChillBlocker™ Socks. Availability: Usually ships the same business day Sealskinz® ChillBlocker™ Waterproof Socks - CLOSEOUT PRICING!! sechsoRegular price: $41.95Sale price: $35.50Size: 1302 Small1306 Medium SEAL1394 LargeSeal1395 X-Large Need more information? Please feel free to contact us at 1-800-592-6940 - Ask for Extension 547 or Internet Sales.