Specifically designed to support the arch of the foot and stimulate circulation thereby reducing plantar fasciitis pain and swelling of the feet. EC3D compression ankle socks stay snug and in place. Even a mid-race downpour will not hamper your performance or cause blistering or irritation. Also available in a HYBRID Combo, which includes a pair of performance and recovery compression calf sleeves. Content: 85% Polyamide, 15% Elastane Sold as a pair Compression grade 20-25 mmHg