This Patagonia wetsuit features high-quality natural rubber using stretchy 85% Yulex natural rubber/15% chlorine-free synthetic rubber by polymer content; natural rubber is FSC certified by the Rainforest Alliance. The interior consists of water-based glue and all-recycled linings with 100% recycled polyester, exterior: 88% recycled polyester/12% recycled spandex. The front-zip design includes a replaceable, corrosion-proof Salmi zipper provides a better seal and extends this suit's lifespan. Supratex kneepads are durable, flexible and hold comfortably to your body without binding or restricting movement. Easy-access key loop included.