Patagonia's all-new Regulator Yulex wetsuits have been redesigned from the ground up, to make them the most sustainable wetsuit from Patagonia yet. The new Patagonia Regulator wetsuits have exclusive linings for increased stretch. The only Fair Trade Certified suits, they're made with 85% Yulexnatural rubber/15% synthetic rubber by polymer content; natural rubber is FSC certified by the Rainforest Alliance. Best for water 38°–48° F/3°–9° C.