Notch Classic Fitted OD Operator cap has all of the features you've come to love in an operator hat; hook & loop patch patch on the front for customization and no button on top so your ear-pro won't hurt. The notches are an added feature that you'll definitely come to appreciate; no more war between your hat and sunglasses! p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px 'Helvetica Neue'} Features include:Patented Notch technologyWorks with virtually any style of glasses (SEE THE PERFECT FIT GUIDE)2" x 3" front hook & loop patchHook & loop patch on top in place of buttonBreathable A-Flex stretch fit fabricStylish structured low profile fitPremium moisture wicking sweatband97% cotton, 3% spandex Which notch location do you need? CLICK HEREWe offer our patented notches in two locations: Standard Notch and Terra Notch (named after our co-founder).The Standard Notch (pictured above) 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: XS/Y, S/M, L/XL, XL/XXL Hat Sizing: To determine your Notch stretch-fitted hat size, measure the circumference of your head where the sweatband of your hat will sit. If you don't have a tape measure, you can also use a string and measure it against a ruler. Find your measurement on the size chart to determine your hat size. Stretch-fitted hats may vary slightly within the same size category. When in doubt, order the next size down. Notch Fitted Hat Size Chart p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px 'Helvetica Neue'} li.li1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px 'Helvetica Neue'} span.s1 {font: 10.0px Menlo} ul.ul1 {list-style-type: disc} li.li1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px 'Helvetica Neue'} span.s1 {font: 10.0px Menlo} ul.ul1 {list-style-type: disc} li.li1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px 'Helvetica Neue'} span.s1 {font: 10.0px Menlo} ul.ul1 {list-style-type: disc}