Patagonia Yulex Regulator Insertable Hood

"The easiest way to add a hood in colder conditions, this insertable hood fits seamlessly under a wetsuit collar to prevent water entry; made from 85% Yulex® natural rubber/15% synthetic rubber by polymer content. Best for water temperatures: 48°–55° F/9°–13° C. Made in a Fair Trade Certified™ factory."

-Patagonia