Western Mountaineering SemiLite

The Western Mountaineering SemiLite is not a standalone sleeping bag but a half-bag, or 'elephant foot' — it covers the lower body only and is designed to pair with a down parka for the torso, forming a complete alpine sleep system. At 369 g, it packs 227 g of 850 fill-power goose down into a 12D nylon ripstop shell using box baffles, with no zipper at all, which removes both weight and a potential cold leak. Rated to a -4°C limit, it delivers a solid warmth-to-weight figure for an alpine piece — around 92 g per degree — precisely because it skips everything a full bag needs above the waist: no hood, no draft tube, no zip. The short-length cut (up to 152 cm) reflects that it only needs to cover legs and hips, not full body height. This is specialist gear for alpine climbers and ski mountaineers already carrying a down jacket, not a general-purpose sleeping bag — pairing it with anything less than a proper insulated parka leaves the upper body seriously underinsulated.