Notch Classic Adjustable Typhon Operator cap is contemporary styling at its best. features rugged ripstop fabric made in the USA by Kryptek. Despite it's dark color, the lightweight mesh will keep your head cool and the notches will make wearing your sunglasses with this hat totally effortless.Which notch location do you need?We offer our patented notches in two locations: Standard Notch and Terra Notch (named after our co-founder).The Standard Notch (pictured here) is designed to work with most wrap-around or sport style sunglasses, shooting glasses, and safety glasses. These styles have a curved appearance, designed to conform to the contour of the head.The Terra Notch is designed to work with most aviator or fashion style sunglasses as well as prescription eyewear. These styles are more squared off at the corners, causing the frame to sit further away from the face. Available sizes: One Size Fits Most Features include: Patented Notch technology Works with most wrap around style sunglasses, shooting, and safety glasses Kryptek Typhon ripstop fabric 2" x 3" front Velcro patch & velcro patch on top in place of button Unstructured low profile fit Low profile velcro strap Note: Because this is a camouflage product, each one will be one of a kind and will vary from the picture seen here. Notch Adjustable Hat Size Chart