Say Goodbye to Blisters: Balega Hidden Comfort socks are designed to keep your feet comfortable and ventilated, even during long distance runs. Ultimate Comfort: With 80% Drynamix Polyester, 18% Polyamide, and 2% Elastane, these socks provide the perfect balance of comfort and support for your feet. 80% Polyester, 18% Polyamide, 2% Elastane New improved elastane throughout for a more structured fit Extra-deep heel pocket ensures the perfect fit. Extra deep heel pocket Cushioning for impact resistance Medium volume construction Medium volume construction New improved elastane throughout for a more structured fit Seamless toe