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