FasciaFix Plantar Fasciitis Relief Sleeve is a unique, multi-zone compression sleeve with a knitted pattern and subtle ‘nodules that help relieve pain and swelling associated with plantar fasciitis. Supports the arch and plantar fascia ligament to help stop heel pain. Promotes healing, enhances circulation and helps minimize the effects of inflammation. Thin enough to be worn under or over socks. Comfortable for all day or all night use. Sizing is approximate and based on Arch Circumference; Small 5"-7.5"; Medium 7.5"-10"; Large 10-12.5"; Extra Large 12.5"-15".