Mountain Hardwear Lamina™ 0F/-18C

Rated to a manufacturer limit of -18°C, the Mountain Hardwear Lamina 0F/-18C is a men's-specific winter mummy bag built for the 4-season / winter bracket rather than year-round use. It uses 1537 g of TemperLite synthetic fill welded into the same seamless Lamina baffle construction found across the range, which spreads insulation evenly and avoids the cold-spot seams of stitched baffles. Total weight comes to 1875 g, packing down to a 45 x 24 cm bundle – a size and mass that reflects its cold-weather remit rather than any ultralight ambition; the roughly 104 g-per-degree-of-warmth figure is typical for synthetic bags at this temperature class, well above what a down bag would need for the same rating. The 20D polyester ripstop shell and plain-weave nylon liner carry a DWR finish, and a fitted draft collar with full-length zipper seals in warmth at the neck and along the closure. Regular sizing fits users up to 182 cm. This is a dedicated cold-season bag, best matched to winter camping or shoulder-season trips into genuinely freezing nights rather than general 3-season backpacking.