Millymook & Dozer Hats are the 1st choice in sun-hat protection ensuring sun-safety while swimming, playing or enjoying the great outdoors. This Australian brand is known for high quality fun and fashionable styles for the younger explorers. UPF 50+ sun protection. Small 51cm (2-5years) / Large 55cm (5+ years). All styles have a break-away chin strap to safely keep hats on active heads. Reversible.