The Ozone Design Inc. Silk Roll Top Sock is an incredibly soft wool firmly knit with the shimmer of silk that creates a luxurious and durable crew sock. The natural temperature regulating qualities of wool are enhanced with the addition of silk. These socks keep you comfortably cool when it's warm and wonderfully warm when it's cool. This amazing blend provides a functionality that adapts to any climate with a soft sheen that provides a look of sophistication and style.