SIZE MAY VARY, PLEASE MAKE SURE TO CHECK PRIOR TO PURCHASE Features fabric made in the USA by Kryptek. This IR resistant fabric is a durable ripstop blend of 50% Nylon and 50% cotton and is popular in many military and paramilitary uniforms. You'll also love the breathable, double-layer sandwich mesh in back, it's super comfortable! What are those notches for?Our patented notches eliminate the interference between your hat & sunglasses, providing the most secure, comfortable fit possible. Features include: Patented Notch technology Works with virtually any style of eyewear SEE THE PERFECT FIT GUIDE Kryptek Typhon ripstop fabric Breathable A-Flex stretch fit fabric Stylish structured low profile fit Premium moisture wicking sweatband Imported Note: Because this is a camouflage product, each one will be one of a kind and will vary from the picture seen here.