Bedhead Swim Legionnaire hats are so soft and comfortable over the ears and back of the neck making them a perfect baby swim hat. Our swim hats are made of high quality chlorine resistant stretch nylon knit with quick drying ability. Swim hats are best for use in a wet environment - at the beach, lake, swimming pool or splashing about under the hose! A cotton rich hat will be much cooler for everyday use. Sizing Guide 37cm / 0- 3 Months / XXS 42CM / 3-6 Months / XS 47cm / 6-12 Months / S 50cm / 1-2 Years / M