Designed after the adult vest, the Bird of Prey vest is made from the most flexible and highest grade neoprene available. Ultra-stretch 1.5mm neoprene, extra large arm holes, ridiculous flexibility, and sewn in floatation gives these vest the perfect bouancy. They are so light, you won't even realize you have a vest on. Please NOTE: These vests are not Coast Guard Approved, but they are skier approved.