What Our Gearhead(R) Experts Are Saying:"This baselayer's superlight, gridded build is the perfect amount of coverage on my winter hikes. I don't overheat on the climb, and the interior's grid structure traps warm air when I'm taking in the view."ThePines Microgrid Ultra-Lt Baselayer Bottom manages our body temperature and moisture during our favorite high-alpine adventures. The fabric blend of partially recycled polyester and spandex provides lightweight warmth and comfort in an eco-friendly package, while its smooth face slips easily inside our bibs, and its plush, microgrid backing wicks away our sweat. Plus, the addition of HeiQ Fresh FFL odor control technology keeps us feeling and smelling fresh during a weekend trip. We built these baselayers to perform beneath competition layers, keeping Jamaica's bobsleigh and skeleton athletes comfortable from warmup to finish.