Winterlite is an excellent choice for harsh-weather environments and demanding adventures in cold temperatures such as mountaineering and late-season hunts. Its NEOVENT-S outer shell is water-repellent, breathable, windproof, and lightweight – ideal where moisture build-up is inevitable. EXPED’s tuck-stitch seam technology enhances the durability of external seams while also improving their moisture resistance. The 3-D footbox is constructed with 11 individual chambers, effectively trapping heat and ensuring feet don’t push through the down insulation and contact cold air. 800+ fill power.