Darn Tough Coolmax Vertex No Show Tab Ultralight Cushion Socks - Women's White Small 4% spandex Ultra-light construction + cushioning + Coolmax = the perfect warm weather running sock Darn Tough's Vertex Ultra-Light Cushion has the sleek feel of a super stripped down, lightweight running sock but delivers cushioning just along the bottom of the foot True seamless contrstruction provides a smooth performance fit and assures there's no slipping, bunching, or blisters Still made in Vermont, USA. Still unconditionally guaranteed for life.