Youth Medium 15" Long - Bicep 7" Youth Large 15.5" Long - Bicep 8" Adult Small 17" Long - Bicep 9" Adult Medium 17.5" Long - Bicep 10" Adult Large 18" Long - Bicep 11" -New Pair Arm Sleeves / Choose Your Color -Sleeves are made of a Polyester / Lycra Blend -Each sleeve has a non slip material on the inside above the bicep to keep in place -Perfect for any sport! -Typically these sleeves will match your t shirt size