These work mitts are made with 3½ oz heavy horsehide grain leather for a sturdy yet comfortable fit. They are treated with Waterstop to repel water and oil and keep your hands dry. Leather reinforcement pieces on the thumb and palm reduce abrasion in critical areas. The 6" cuffs have silver retroreflective stripes with high visibility coating for better visibility at night. These mittens are sewn with Kevlar thread for extended seam integrity.