.Global delivery.Dedicated support.The Acorn original! This famous slipper sock has been comforting the feet of astronauts since 1982. Cotton twist uppers of 93% hypoallergenic cotton and 7% spandex. Ragg wool uppers of 85% wool, 13% nylon, and 2% spandex. In addition to comfort, the full-grain leather sidewall and suede leather outsoles offer durability. These slipper socks feature a lofty Acorn memory-foam midsole over a comfort cushion layer of featherweight EVA