Mountain Hardwear Women's Shasta™ 0F/-18C

The Mountain Hardwear Women's Shasta 0F/-18C is a dedicated cold-weather mummy bag, using Thermal.Q recycled synthetic insulation rather than down, and rated by the manufacturer to a -11°C comfort and -18°C limit temperature — solidly in 4-season/winter territory. At 2258 g it's the heaviest bag in this Mountain Hardwear women's synthetic lineup, which is the direct cost of that temperature range and of recycled synthetic fill, which trades some warmth-per-gram efficiency for lower environmental impact and reliable performance when wet. The build includes a full-length insulated draft tube behind the zipper to stop heat loss at the closure, a shaped draft collar around the shoulders, a fitted contoured hood, and an internal pocket for small items. The 20D ripstop polyester shell, full-length two-way YKK zipper, and included stuff and storage sacks round out a straightforward winter-camping package. Sizing fits users up to 172 cm. It's built for women camping in genuinely cold conditions — winter trips or high-altitude shoulder season — where warmth and reliability outweigh pack weight.