Western Mountaineering Antelope GWS

The Western Mountaineering Antelope GWS is a four-season winter mummy bag rated to a -15°C (5°F) limit, with a separate -10°C comfort figure — worth noting since the two ratings define different margins of safety. It carries 737 g of 850+ fill power down within a total weight of 1,275 g, making it one of the heavier, warmer bags in the lineup by design. What sets it apart from the non-GWS Antelope is the Gore Windstopper 830 (Gore Infinium) shell, a waterproof-breathable membrane that blocks wind and moisture far better than standard downproof nylon — genuinely useful in exposed alpine conditions where wind chill drives heat loss as much as ambient temperature. A differential cut, adjustable fitted hood, and insulated draft collar and draft tube round out the cold-weather detailing. At 1,275 g this isn't a bag for casual three-season use; it's built for early-spring-through-late-fall alpine trips where the membrane shell and winter rating justify the extra weight over a standard-shell equivalent. Made in the USA, fits users up to 183 cm, and ships with both stuff and storage sacks.