Patagonia R4 Yulex Regulator Round Toe Surf Boots

"These winter wetsuit booties are made from stretchy 5mm 85% Yulex® natural rubber/15% synthetic rubber by polymer content, with a full-foot design for increased warmth. Best for water temperatures: 38°–48° F/3°–9° C. Made in a Fair Trade Certified™ factory."

Patagonia.ca