The physiologix essential range is designed to deliver light support and maximum comfort without restricting movement enhanced lightweight, breathable, durable stabilizer that provides support whilst helping to prevent re-Injury ergonomic design to provide uniform support & compression 360O stretch, contour design prevents slippage & ensures a proper fit re-Enforced edges for durability measure around the wrist joint for your size small (S) - 3-5"/8-13Cm medium (M) - 5-8"/13-20Cm large (L) - 8-10"/20-25Cm extra large (Xl) - 10-12"/25-30Cm please note: sizes are for guideline purposes only and may vary slightly