Platypus Australia: Hats are essential for sun protection, but this one goes the extra mile. Wide brims on hats offer good shade. No need to take them off in the water, the quick drying fabric will keep heads cool, wet or dry. Comfortable fit. UPF 50+ offers excellent sun protection, the highest possible, blocking out more than 97. 5% of the sun's harmful rays. Fabric is a high quality Matt Nylon LYCRA XTRA LIFE , ultra chlorine resistant, breathable and quick drying. Xtra Small size fits 0-18 months. Small size fits a 2-4 year old boy. Medium size fits a 6-8 year old boy. Swim top80% Nylon and 20% LYCRA XTRA LIFE Hand wash only Shop At House Of Fraser