calamus upf 50 boonie sun hat– sun protection hat, fishing hat, beach & hiking hat, golf hat, hunting hat, paddling, rowing, & kayaking - kaki calamus calamus is the extremely lightweight hollow tube or quill of a feather. designers have carried this “light as a feather” theme throughout the calamus apparel product line. the calamus boonie sun hat is designed for protection, function, and fashion. this boonie hat is rated upf 50 and is made to protect your face and neck from sun damage without having to apply sunscreen for every outdoor adventure. manufactured from light-weight breathable materials, this gear will not only protect you from the sun but will help keep you cool and comfortable during a long day in the great outdoors. the vented mesh sides help to boost air flow to make sure you stay cool and dry. the head band is lined with light-weight breathable material to wick moisture away from your forehead to keep you cool and comfortable. we have also included a built-in elastic draw cord allowing you to adjust to any size for a snug comfortable fit. simply press the draw cord toggle button, pull on the tab, and then release the lock to set to your size. stay protected and hidden in style with the calamus boonie sun hat!