Patagonia Winter Weight Fleece Oversocks Made from thick, double-faced fleece, these fishing socks are built to keep your feet warm in the coldest winter conditions; they?e also an ideal companion piece for the seamless Middle Fork wader booties. * 18-oz Polartec 86% polyester (80% recycled)/14% spandex double-faced fleece provides maximum warmth Designed to be worn over a sock for extreme winter fishing conditions * Can also be worn as a volume-adding companion piece with seamless wader booties