The Men’s R4 Regulator suit is a high-performance, neoprene-free wetsuit made of 85% Yulex natural rubber/15% synthetic rubber by polymer content with a recycled nylon lining. The natural rubber is from sources that are Forest Stewardship Council certified by the Rainforest Alliance.The torso/thighs have solution-dyed fast drying 51% recycled nylon, 44% recycled polyester, 5% recycled spandex thermal lining that offers excellent warmth and flex. Additional features includeSolvent-free AquaA glue, a corrosion-proof zipper that’s replaceable and has aneasy-access key loop on inside, and Supratex kneepads and cuffs for durability without restricting movement.Suggested water temperatures: 3848 F/39 C. Made in a Fair Trade Certified factory.