Reducing the harmful impact of traditional wetsuits, the Patagonia Women's R1 Lite Yulex Vest replaces traditional neoprene with bio-based Yulex rubber. This revolutionary breakthrough in wetsuit design retains the performance capabilities and warmth of a traditional wetsuit, but without the toxic chemicals and petroleum intensive methods of neoprene wetsuit production. Patagonia claims an astounding 80% reduction in CO2 emissions from replacing neoprene with natural Yulex rubber. This 1. 5-millimeter wetsuit vest adds a touch of extra warmth during chilly mornings and breezy conditions. It's rated for water temperatures ranging from 65 to 75-degrees, making it a great addition to your warm water arsenal. The pullover design maximizes flexibility when you're paddling out into the line-up and dropping into peeling point breaks. Smooth flatlock seams won't chafe or irritate sensitive skin. Also, there's a rubberized waist gasket that keeps water from seeping inside and chilling your core.