If you thought a great thing couldn't get even better, you don't know Patagonia very well. The Women's R1 Lite Yulex Vest replaces traditional neoprene with bio-based Yulex rubber, and in 2019 the formula has been re-engineered to be even softer, even stretchier, and ever comfier. We like how 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.