Built for bone-chilling temps, the Mountain Hardwear Phantom Belay Down Parka boats 800-fill power down for an ultra-lofty, ultra-packable jacket for mountaineers, ice climbers, and winter adventures. That responsibly sourced down gives us great warmth for the weight with an insulated draft tube and box wall baffles that eliminate cold spots to maintain our core temperature we're belaying, stopping for a lunch or snack break, or huddling up at camp. The diamond-fused Pertex ripstop shell may be lightweight, but it's also abrasion-resistant and reinforced in high-wear areas that may rub against rocks, packs, and harnesses. When we're not wearing it, the Phantom Belay Parka packs down small when we stuff it into the included stuff sack.