Yulex® JammerThe Mens Yulex Natural Rubber Jammer is made for all your open water adventures. Featuring 1. 5mm thickness throughout and an adjustable drawstring they provide core warmth and protection from the elements while allowing great freedom of movement, whatever the activity. They are eco friendly too; by using natural rubber, the jammers CO2 emissions are reduced by up to 80% supporting the global mission to reducing our carbon footprint.