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 45°–55° F/7°–13° C. Made in a Fair Trade Certified™ factory. The Regulator® 5mm Round Toe Booties is fully backed by our Ironclad Guarantee and you can find it on Patagonia.com. | Patagonia Regulator® 5mm Round Toe Surf Booties in Black, Size 11