The Women's Patagonia Yulex Regulator Lite Wetsuit Vest is formfitting and made with a flexible blend of 85% Yulex natural rubber and 15% chlorine-free synthetic rubber by polymer content, with natural rubber certified by Preferred by Nature. It includes stretchy, solution-dyed linings featuring an interior of 100% recycled nylon and an exterior of 83% recycled nylon and 17% spandex. The linings are bonded with water-based, solvent-free AquaA glue, offering comfort, performance, and a lightweight feel suitable for warm-water activities.