SportFlexĂ– Series Arm Sleeve is heavier than the standard arm sleeve Perfect to wear as protection from the sun or to keep warm in the cold Lightweight and machine washable Soft and comfortable construction Materials: 87% Polyester/13% Elastane Medium fits: Bicep: 11" Wrist: 7" Length: 19.5" Large fits: Bicep: 12.5", Wrist: 8" and Length: 20.5" 50+ UV Protection. ARMSLEEV SPFLX PIN FLM MD