These socks are named after New Zealand's Brushtail Possum. Their hair has a smooth, hollow structure, similar to a polar bear, the fiber is 55% warmer than Merino wool and 14% lighter. It's also naturally quick-drying and antimicrobial. 

Small - (US Men 4-8 | Women 5-9)
Large - (US Men 8-12 | Women 9-13)