The Physiologix Essential Ankle Support is designed to provide light support and maximum comfort without restricting movement. It features an enhanced, lightweight, breathable, and durable stabilizer that helps prevent re-injury. The ergonomic design provides uniform support and compression, while the 360° stretch and contour design prevent slippage and ensure a proper fit. The re-enforced edges add to the product's durability. To find your size, measure around the smallest point above the ankle bone. Please note that sizes are for guideline purposes only and may vary slightly. Available in Small (5-8"/17-20cm), Medium (8-9"/20-23cm), Large (9-10"/23-25cm), and Extra Large (10-11"/25-28cm).