The Rototo R1488 Pile Sock Slipper exists in a category of its own, conceived as a genuine alternative to the slipper rather than just a thick sock. The carpet-like pile interior has a softness and warmth that you feel immediately whether worn barefoot or pulled on over a pair of socks as an oversock, and the acrylic-wool blend is built specifically for heat retention and a gentle feel in the depths of winter. This season's update introduces a mixed two-color heather construction that gives the fabric a natural resistance to staining and pilling, making it a more durable everyday option than previous versions. The kind of thing you put on once and immediately understand why people replace their slippers with these. 53% acrylic, 36% wool, 7% nylon, 3% polyester, 1% polyurethane table { width: 100%; border-collapse: collapse; } th, td { border: 1px solid black; padding: 8px; text-align: center; } th { background-color: #f2f2f2; } Size Small Medium Large US Men's Shoe Size 4-7 7-10 10-13