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. BEST SUITED TO: Babies, crawlers and toddlers still using prams, strollers, car seats, carriers & slings. FEATHERS Chlorine resistant fabric - pool safe Rated UPF50+ Excellent Protection Tested in accordance with Australia & New Zealand Standards 4399 Sun-Smart recommended brim depths (see tab below for measurements) Made from 100% PBT Nylon stretch knit Wash & Wear - gentle cold machine wash and line dry in the shade 'Return to' label to help hats get home safely Stretch chin strap with adjustable toggle SIZE ADVISE AND BRIM DEPTH One fact you can be sure of - no two heads are the same! ALWAYS measure your child's head before purchasing to ensure getting the accurate size. Step 1: Distract the child with a toy or food (so they don't try and help you!). Step 2: Use a measuring tape to take measurement. Otherwise use a ribbon to take the size then use a ruler to find the measurement. Step 3: Purchase the size closest to your childs measurement. Our hats are very stretchy and will grow up to 4cm. FOR EXAMPLE: The child measures 41cms, you will need the 42cm size that will stretch another 4cms up to 46cms - giving plenty of future wear. Purchasing the next size up would be too large and block the childs vision.