Topex Siggi Unisex Outdoor SPF 50+ Packable Boonie Hat Mens Bucket Sunhat Quick-dry Fabric:100%nylon M size best fits for 57-59cm 22.4"-23.2" 7 1/8 - 7 3/8. L size best fits for 59-61cm 23.2"-24" 7 3/8 - 7 3/4.(has an elasticized locking draw cord to adjust for head size) UPF50+: the 3" wide brim blocks most sun UV rays and provides excellent coverage for face&neck while outdoors. Packable: easily packed / folded / rolled in a back pack or suitcase. Great for kayaking, beach trip, travel, gardening, boating or yard work. VERSATILE: flop down the brim to be a bucket boonie hat; button brim up to be a stylish cowboy hat. When ships from and sold by Comhats, it takes 8-12days to be delivered. If you hope to get a PRIME service, please choose "Sold by Comhats and Fulfilled by Amazon".