Patagonia Women's R1 Lite Yulex Long-Sleeved TopPatagonia Women's R1 Lite Yulex Long Sleeved Top A stretchy, neoprene free wetsuit top made of 85% Yulex natural rubber 15% synthetic rubber by polymer content; the natural rubber is from sources that are Forest Stewardship Council certified by the Rainforest Alliance. Best for water 6575 F 1823 C. Made in a Fair Trade Certified factory. Made with Natural Rubber: Stretchy 85% Yulex natural rubber 15% chlorine free synthetic rubber by polymer content;