A warm base layer made of itch-free Merino wool, trimmed with A-TACs camo fleece. The best base layer you can get. The MHS bottom is an extremely effective base layer built for maximum comfort in physically demanding situations. The main body is constructed with a stretchy Merino wool blend (itch-free) - a fabric that will keep you warm but breathes extremely well so you don't overheat and get soaked with sweat. The fleece trim is printed with A-TACS camo, one of the most advanced camouflage patterns available, available exclusively through Browning for hunting applications.