Our new, neoprene-free Yulex wetsuits are made of 85% natural rubber/15% synthetic rubber by polymer content. Replacing a petroleum-based material with a plant-based one, they offer the same warmth and performance attributes as conventional stretch neoprene while reducing CO2 emissions by up to ~80% in the manufacturing process. Derived from sources that are Forest Stewardship Council'…¾ 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. With an anatomical, performance-focused design that maximizes comfort and flexibility while minimizing weight, the pared-down R1 Lite Yulex Long John is 2mm with a high-stretch, fast-drying 100% recycled polyester lining; the face fabric is 88% recycled polyester/12% spandex. The open-arm design offers full freedom of movement for paddling and other high-output activities. All seams are triple glued, blindstitched and internally taped at high-stress areas. Easy-access key loop included. Suggested water temperatures: 65-'…â€œ75° F/18-'…â€œ23° C.