Ensure your little swimmer is warm and comfortable from the start of their lesson to finish. Our Cozy Swimmer thermal swimsuit features high-quality SBR foam, allowing the body to retain heat and keeping your swimmer cozy. The Cozy Swimmer is the perfect swimsuit for beginners, ages 6 months to 6 years. This suit allows for full range of motion, and even has room for a swim diaper underneath. Easy to take on and off: the baby suit features two straps to provide a secure and adjustable fit, while the youth suits feature a quarter frontal zipper.