Made from bamboo and Model these socks are ultra thin for lightweight comfort in warm climates. These are Dexshell’s thinnest socks. Specs: Outer Shell: 37% polyamide, 32% Modal, 29% cotton, 2% elastane Interlining: Porelle® membrane (100% PU) Inner Sock: 60% bamboo rayon (viscose), 40% polyamide