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'ƒâ€¦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 R3 Yulex Back-Zip Full Suit is 4.5mm in the torso and thighs, lined with high-stretch, fast-drying 51% recycled polyester/44% polyester/5% spandex inverted microgrid; 3.5mm in the arms and legs, lined with high-stretch, fast-drying 100% recycled polyester jersey; the face fabric is 88% recycled polyester/12% spandex. The center back-zip allows easy access and has an internal gasket to prevent water entry. Supratex kneepads and ankle cuffs provide excellent abrasion resistance and increased durability. 100% external seam sealing; all seams are triple glued, blindstitched and internally taped. Easy-access key loop included. Suggested water temperatures: 48-'ƒâ€¦¢â‚¬Å“55° F/9-'ƒâ€¦¢â‚¬Å“13° C.