What Our Gearhead(R) Experts Are Saying: "When it's single-digit temps or you're layering up for a big alpine mission, this grid fleece bottom is my go-to. It traps heat incredibly well without feeling bulky, and the 3/4 cut fits perfectly with ski and snowboard boots."Built for brutal cold and extreme missions, the Heavyweight Antarctic Grid Fleece 3/4 Bottom is Le Bent's warmest base layer for high-performance winter layering. Whether we're skinning in the early morning freeze or layering up under a shell for bitter resort days, this bottom provides thermal efficiency without compromising breathability. The advanced grid fleece design helps trap warm air close to the body while allowing moisture to escape when our pace picks up. Made from a soft, functional blend of merino wool, rayon, recycled polyester, and a hint of elastane, this baselayer balances sustainability, stretch, and serious insulation. The 3/4 cut eliminates bulk under boots, keeping our fit streamlined and performance-ready in deep winter conditions.