We reformulated the Yulex material in our spring suits to make it lighter, stretchier and more comfortable. Offering full-arm warmth and sun protection, our neoprene-free R1 Lite Yulex Long-Sleeved Top is made of 1.5mm 85% natural rubber/15% synthetic rubber by polymer content. Replacing a petroleum-based material with a plant-based one, it offers the same performance attributes as conventional stretch neoprene while reducing CO2 emissions by up to ~80% in the manufacturing process. Tapped from sources that are Forest Stewardship Council certified by the Rainforest Alliance, we blend the natural rubber with chlorine-free synthetic rubber to increase ozone- and UV-resistance and meet our rigorous standards for strength, stretch and durability. The interior lining is stretchy and fast-drying 100% recycled polyester; the exterior fabric is made of durable, water-resistant 88% recycled polyester/12% spandex. The exterior fabric and interior lining are now solution-dyedusing 86% less water than conventional dyeingand are laminated with water-based AquaA glue that's free from harmful volatile organic compounds (VOCs). A streamlined anatomical design holds snug to the body for maximum comfort and flex; other features include a vertical front-zip entry with corrosion-proof Salmi zipper and an easy-access key loop. Seams are sewn with flatlock construction for next-to-skin comfort and durability. Made in a Fair Trade Certified facility. Suggested water temperatures: 65-75√Ç¬∞ F/18-23√Ç¬∞ C.