evo.com | Burton Long Underwear Tops > The Burton Merino Blend Midweight Base Layer Crew Top is Burton's warmest base layer, and it earns that title honestly, a merino wool blend that traps heat naturally instead of faking it with synthetics. Merino regulates your temperature and fights odor on its own, while 360deg stretch keeps all that warmth from ever feeling bulky under a shell. Grab this one when the forecast is looking rough. Chafe-free Softlock Seams for Comfort Midweight Wool 245GSM 57.6% Merino Wool, 38.4% TENCEL(TM) Lyocell, 4% Spandex. Slim FIt A slim fit with four-way stretch makes for easy layering and an unrestricted feel. Natural Blended Merino Performance Warmer than similar-weight synthetics, the midweight merino blend offers natural temperature regulation, breathability, and odor resistance. Double Needle Stitching on Sleeves and Hem | Burton Blend Midweight Base Layer Crew Top Men's 2027 - Large Black | Spandex/Wool