When were pushing hard in cold air at high elevations, the Backcountry Pines Microgrid Ultra-LT Baselayer Crew Top delivers the lightweight warmth and moisture control we need to stay focused. Athlete-inspired and mountain-tested, this next-to-skin layer balances breathable performance with a soft, streamlined feel that moves naturally with us through every stride and transition. The partially recycled poly/spandex blend features a microgrid fleece back for low-bulk warmth and a smooth face for easy layering. Flatlock seams and raglan sleeves with integrated gussets eliminate chafing and allow full range of motion, while HeiQ Fresh FFL odor control keeps things fresh through multi-day missions. Whether were skinning toward a ridgeline or racing the sunset on a trail run, this crew keeps us warm, dry, and ready for the next move. Ultralight baselayer designed for any and all of our cold weather adventures Microgrid fleece back traps warm air while releasing excess heat Smooth face fabric layers easily under shells and insulation Polyester and spandex blend offers stretch and thermoregulating performance Next-to-skin fit with gusseted raglan sleeves for full mobility on the go Flatlock seams prevent chafing during long, active days Streamlined thumbholes help sleeves stay in place under layers HeiQ Fresh odor control keeps fabric fresh through extended wear