24" Kevlar Sleeve With Thumb Slot. 1 EA These sleeves are knitted from 100% Kevlar fibers. They are double-layered sleeves which provide cut-resistance, flexibility, and comfort. Additionally, they also protect forearms from minor heat and burn injuries. A thumb slot prevents the sleeve from twisting while in use. Or, if you prefer, the sleeve is also available without a thumb slot for easier on and off. (Part numbers on image are for 18" sleeves. Please ignore.)