The elastic in the mouth of the domestic merino wool ankle sock is not tightened Merino wool is a breathable and warming natural fiber, and it moves moisture away from the skin Seamless tip in flower Variable temperature, keeps feet dry Material: 80% Merino wool, 15% Polyamide, 5% Elastane Washing instructions: at 40 degrees, tumble drying is not recommended. Wash inside out with the same colors.