Flap Happy Baby and Childrens Swim Flap Hat UPF 50+, Highest Certified UV Sun Protection, Azo-free dye, Floats on Water 82% Polyester, 18% Spandex Imported Machine Wash BLOCKS UV RAYS: UPF 50+ designation is the highest UV protection certification available which blocks 97.5%+ of cancer causing UV rays from penetrating the material. GOODBYE SUNBURNS: The front brim and long neck flap design shades your precious little ones face, ears, and neck from the harsh sun, meaning more time having fun in and out of the water. COMFORT & QUALITY: UPF 50+ fabrics can be heavy and sweaty to wear, however, our fabric is lightweight and breathable to maximize comfort. 92% Polyester 18% Spandex, soft elastic allows for a snug & comfy fit. MULTIFUNCTIONAL: Never lose a hat again in the water. The foam brim and lightweight quick-dry fabric allows the hat to float if it falls into the water. The crushable brim collapses to provide an efficient use of space in your diaper or beach bag.