Siggi Summer Bill Flap Cap UPF 50+ Cotton Sun Hat with Neck Cover Cord for Women cotton/ramie, pls find accurate % in Description. FREE SIZE: with an adjustable tape at back built-in sweatband. Best fit for 55-58cm 21.6"-22.8" 6 7/8 - 7 1/4. DETACHABLE CHIN STRAP: adjustable for a better fit; won't blown off when it gets windy. SPF 50+: this sun hat has passed UPF 50+ test, it could block 97.5% or more of sun UV rays. Great ventilated to keep you cool in summer. WIDE BRIM: measures 4"-4.7" in length, is large enough to shade forehead, neck and cheeks from sun lights. When shipped by Comhats,it will be fulfilled within 2 days. Usually it takes 8-10days to be delivered. If you hope to get a PRIME service, please notice to choose "Fulfilled-by-Amazon". You can return this item for any reason and get a full refund: no shipping charges. The item must be returned in new and unused condition. Go to Your Orders to start the return Print the return shipping label Ship it!