Sockwell Women's Plantar Relief Cush Crew 33% Merino Wool, 33% Bamboo Rayon, 28% Nylon, 6% Spandex Made in US 20-30 mmhg firm compression minimizes planter fasciitis heel pain Non-binding top and freedom fit at toe box Blister resistant seamless toe closure for fit and comfort Supports Plantar Fascia and encourages blood flow to reduce inflammation Merino wool is soft and helps control moisture management and thermoregulation