Boss Cowhide Leather Driver with Ball and Tape Closure, White, X-Large, 1-Pair. Boss Cowhide Leather Driver is built for dependable protection and all-day wear on demanding jobs. Durable cowhide leather delivers natural strength and abrasion resistance, while a split leather palm patch reinforces high-wear areas for extended glove life. A keystone thumb promotes flexibility and range of motion, and the slip-on cuff with ball-and-tape closure provides a secure, no-nonsense fit that stays in place while you work.