3/2 mm Foil - Back-Zip wetsuit for boys between 4 and 16 years old . The Billabong 302 Foil wetsuit is suitable for children and teens aged between 4 and 16. The outer fabric made from flexible and above all robust Superflex neoprene with Superlight Foam made from upcycled car tyres combines great heat retention and high stretch. The flat seams prevent chafing, while the high collar provides additional protection against water ingress. This wetsuit is ideal for long days at the beach and extended surf sessions.