Fall in love with Kosha's super soft, Oatmeal Merino Wool and Bamboo Thermal Pants for Boys. It's a temperature regulating fabric, making you feel warm in extremely cold climate and cool in hot temperatures. Fine Bamboo fibers provide a soft and cool feel while Merino wool fibers provide warmth and halt the stench developed during high output outdoor activities. The two natural fibers are knit together to create a lightweight base-layer for you.