This sun hat is made of lightweight polyester and has a pliable brim that easily compresses to fit in a pack or pocket. With a UPF 50 rating for sun protection and a secure fit provided by the stretchy polyester plain weave fabric, the Sinsola is the perfect bucket hat for prolonged sun exposure. The laminated brim maintains its shape while still being fully compressible, allowing for easy storage in a pocket or backpack.