Our Unisex UV Protection Sleeves are Lightweight and Breathable 90% Poly & 10% Spandex. Great for most outdoor activities (Fishing, Rowing, Canoeing, Hiking, Kayaking, paddling, etc.) *S/M - Bicep 10.5" - 13" Length 13"-15.25" *L/XL - Bicep 17" - 18" Length 18.25"-19.25"