10 button hole wrap over fastening. High quality, long-life, resin buttons. Unisex sizing. Size Chest (to fit) XS – 37″ S – 40″ M – 43″ L – 46″ XL – 49″ 2XL – 52″ 3XL – 56″ Wash Instructions 85 Degrees C industrial laundry. 60 Degrees C domestic wash.