REI Co-op Magma 850 Down Hoodie - Women's vs Mammut Broad Peak IN Hooded Jacket

Warmth is critical for hiking in cold environments, where a jacket must retain body heat without adding bulk. The REI Magma 850’s 850-fill down gives it a slight edge in warmth-to-weight efficiency, with buyers consistently calling it the warmest jacket in its class and praising how it keeps them toasty in sub-freezing conditions. The Mammut Broad Peak is also exceptionally warm, with wind-resistant fabric and high loft that keep users cozy even in blustery weather, though a few note it’s slightly less insulating than top-tier competitors. For most hikers seeking maximum heat in minimal weight, the Magma 850’s superior fill power delivers a tangible advantage in extreme cold.

Fit determines how well a jacket layers and moves with your body during activity. The Mammut Broad Peak offers a more refined, purpose-built athletic cut with elasticated hood and cuffs that provide a secure, snuggy fit praised by many for its mountain-ready design, though some find it snug when layering. The REI Magma 850 has a slim, tailored silhouette that looks sleek but can feel restrictive in the shoulders and limit mobility during climbing or reaching motions. For hikers who need to wear midlayers underneath or demand a more forgiving fit, the Broad Peak’s slightly more accommodating shape and hem adjustment make it the more versatile option for active use.

Durability matters when your jacket faces abrasion from rocks, brush, and frequent packing. The REI Magma 850’s ripstop nylon shell and durable water repellent finish have earned consistent praise for resisting wear and keeping moisture out, with users noting the fabric feels sturdy even after extended use. The Mammut Broad Peak uses abrasion-resistant Pertex Quantum fabric, which holds up well in rough conditions, though a few users report minor issues like loose threads or feather leakage. While both are well-made, the Magma’s simpler, proven construction gives it a slight edge in long-term resilience under heavy use.

Comfort affects how enjoyable a jacket feels against the skin during long days on the trail. The Mammut Broad Peak stands out with its plush microfleece lining, soft chin guard, and smooth zippers that create a cozy, almost luxurious feel, with buyers repeatedly calling it the most comfortable down jacket they’ve worn. The REI Magma 850 is warm and wind-protective, but its shell fabric and minimal interior lining result in a less plush experience, with some noting slight noise or less tactile softness. For hikers who value next-to-skin comfort and a quiet, soothing feel, the Broad Peak is the clear winner.

Packability is essential for hikers who need to stow their jacket quickly in a backpack without taking up valuable space. The Mammut Broad Peak is exceptionally compressible, packing down to the size of a Nalgene bottle and weighing just 10.5 oz, making it the most packable option in this comparison. The REI Magma 850 also packs well into its own pocket and is ultralight, but it’s slightly bulkier and heavier at 13.5 oz. Buyers consistently rate the Broad Peak as the most packable, with its compact storage and lighter weight giving it a decisive advantage for minimalist or multi-day treks where every ounce counts.

Mobility ensures you can move freely while climbing, reaching, or adjusting gear on the trail. The Mammut Broad Peak is designed for active use, featuring thumb hooks, higher pockets compatible with harnesses, and a cut that allows full range of motion without restriction—buyers specifically note its suitability for climbing and squatting. The REI Magma 850 has gusseted elbows but still receives complaints about shoulder tightness and limited reach, making it less ideal for dynamic movement. For hikers who need a jacket that moves with them during technical terrain, the Broad Peak’s thoughtful design delivers a clear and practical advantage.