Flap Happy Baby Girls' UPF 50+ Double Ruffle Hat 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 ruffles provide optimal protection on the face, neck and ears. COMFORT & QUALITY: We developed our fabric to be lightweight & breathable for maximum comfort & protection. GENTLE: 100% Cotton provides only the gentlest touch. CALIFORNIA BORN: For the last 30+ YEARS, weve been designing and testing our hats in sunny Santa Monica, California. This has given us the time and environment to PERFECT the hat fit and design.