Whether you're ripping through white water or hauling in the catch of the day, the Mustang Survival Regulate 175 Base Layer Top is the baselayer you'll want for all of your adventures on the water. It's made with a blend of polyester and merino wool, giving you the perfect balance of quick-drying performance and temperature-regulating comfort. Thanks to merino wool you've got breathability when you're working hard reeling a big catch or navigating rocks and currents. It'll also keep retain its warmth when wet, so you won't wind up as a floating ice cube out there. The polyester infusion helps this top wick moisture and dry quickly to keep you comfortable, while flat-lock seams resist chafing, even when you're soaked to the bone.