Field note
What down fill power means
Updated October 5, 2026
Amount matters more
A 1000-fill jacket with very little down can be colder than a 700-fill jacket with a lot of down. Look at fill weight when it is published, not only the fill-power badge.
Down and water
Any fill power collapses when soaked. Synthetic insulation is the wet-weather alternative. Dry the jacket. Do not stuff wet down in a compression sack and forget it.
Gear that shows the point
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Best default camp puffy
REI Co-op Magma Hooded Down
Put this on when you stop. If you hike in it, you will soak the down from the inside, which is worse than rain. The hood is the feature that makes camp tolerable in wind. Return it if the shoulders bind over a fleece.
Who should buy it. Three-season backpackers who need a static layer.
Pros
- Hood
- Packs small
- Returnable
Cons
- Useless when soaked
- Too warm to hike in
Not sold on Amazon US.
Closest on Amazon: Mountain Hardwear Ghost Whisperer Hoody. An 800-fill ultralight down hoody that does the same job as the Magma Hooded Down. The price on the listing varies by color.
Check current price on the listing.
Ultra-light down jacket
Montbell Plasma 1000
The Plasma is a luxury ounce-counter. It is not tougher than it looks. Wear it in camp, not on a bushwhack. If you will own one puffy, a slightly heavier one may be the better only jacket. If you already own a burly one, this is the travel piece.
Who should buy it. Experienced hikers shaving jacket weight.
Pros
- Extremely light
- Warm for the mass
- Stuffs tiny
Cons
- Expensive
- Delicate shell
High-end narrow mummy
Western Mountaineering Alpinlite
Western Mountaineering bags are sewn as tools. The Alpinlite is warm for its rating class and tight if you sleep in a starfish. Try the girth, not the stuff sack. It is a poor value if you only camp twice a summer.
Who should buy it. People who sleep cold, know they like a mummy, and will use it for years.
Pros
- Warm for the weight
- Durable shell
- Hood that actually closes
Cons
- Expensive
- Narrow cut
Check current price on the listing.
FAQ
Is 800 enough?
For most hiking, yes.
Does fill power apply to synthetic?
No. That number is a down measure.
