McDavid HexPad Power Shooter Arm Sleeve - Purple, Medium Arm compression offers consistent muscle warmth and prevents abrasions and scratches 9mm HEX Technology padding at the elbow offers extra protection hDc Moisture management Technology keeps you cool and dry Machine washable/dryable Size(Forearm Circumference)= XS: 9-10"; SM: 10-11"; MD: 11-12"; LG: 12-13"