Verdict
Head-to-head · Best Down Jackets

Arc'teryx Cerium Hooded Down Jacket vs Decathlon Forclaz Simond MT100 Hooded

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

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The short answer

Arc'teryx Cerium Hooded Down Jacket comes out ahead by a clear margin (4.6 vs 4.1). Arc'teryx Cerium Hooded Down Jacket is best for: Ultralight backpackers who prioritize packability and precise layering under a shell. Read the strengths below before deciding.

Arc'teryx Cerium Hooded Down Jacket
Higher ratedRanked #1 in Best Down Jackets
Arc'teryx Cerium Hooded Down Jacket
2 sources$400as of Oct 10

The Arc'teryx Cerium Hooded Down Jacket leverages 850-fill goose down and Coreloft synthetic insulation to deliver exceptional warmth-to-weight efficiency, weighing just 10.2 ounces for a women's small. Switchback Travel found the premium down provides heat retention comparable to significantly heavier loads, while Better Trail highlighted that strategic synthetic placement in high-moisture zones maintains performance when damp. However, the jacket carries a premium price point of $400 and features a trim fit designed strictly for layering under shells; Better Trail explicitly warned that this silhouette does not allow for wearing over bulky midlayers. Outdoorgearlab noted the PFC-free DWR finish offers only average water resistance during testing, requiring users to add an outer shell in sustained wet conditions. This jacket fits ultralight backpackers and ski tourers who prioritize packability and precise layering, but those seeking a relaxed fit or standalone weather protection should look elsewhere.

Strengths
  • — Uses premium 850-fill goose down combined with Coreloft synthetic insulation in moisture-prone areas like the collar and underarms to maintain warmth when damp.
  • — Delivers an exceptional warmth-to-weight ratio, weighing approximately 10.2 ounces for a women's small and 11.9 ounces for a men's medium.
  • — Constructed with recycled Arato nylon face fabric (15D on current model) treated with a PFC-free durable water repellent finish.
Watch-outs
  • — Carries a premium price point, typically retailing between $375 and $400.
  • — The trim fit is designed for layering under shells and may feel restrictive when worn over bulky mid-layers.
Decathlon Forclaz Simond MT100 Hooded
Ranked #7 in Best Down Jackets
Decathlon Forclaz Simond MT100 Hooded
2 sources$80as of Oct 10

The Decathlon Forclaz Simond MT100 Hooded delivers exceptional value through its 800-fill-power RDS-certified down, which Outdoorgearlab found provides adequate warmth for mild conditions despite the jacket's low cost. However, the non-stretchy shell restricts mobility by pulling upward when reaching overhead, and sizing runs small with a slim fit that requires buyers to order up for comfort or layering. The oversized hood lacks adjustment cords, leaving gaps around the face in windy weather. This highly packable puffer fits budget-conscious hikers and climbers who prioritize weight savings over technical precision, while those needing a loose fit or superior wind protection should look elsewhere.

Strengths
  • — Insulated with high-quality 800-fill-power RDS-certified down that provides excellent warmth-to-weight ratio.
  • — Extremely affordable price point significantly lower than comparable name-brand puffers.
  • — Highly packable design allows the jacket to zip entirely into one of its hand pockets for easy storage.
Watch-outs
  • — Sizing runs small with a slim, snug fit across the chest and waist, requiring buyers to size up.
  • — Limited mobility due to a non-stretchy shell that pulls upward when reaching overhead or making hugging motions.
  • — The hood is oversized and lacks adjustment cords, leaving gaps around the face in windy conditions.

How they stack up

Arc'teryx Cerium Hooded Down Jacket

The Arc'teryx Cerium Hooded Down Jacket offers a trim fit designed for layering under shells. It utilizes 850-fill goose down combined with Coreloft synthetic insulation to maintain warmth when damp, whereas competitors like the Decathlon Forclaz Simond MT100 rely solely on standard 800-fill power down.

Decathlon Forclaz Simond MT100 Hooded

At 10.3 oz, the Decathlon Forclaz Simond MT100 Hooded is lighter than the 11.9 oz Arc'teryx Cerium Hooded Down Jacket and the 15.4 oz Outdoor Research Helium Down Hoodie, and it costs far less than either. Its 800-fill down is a step below the Arc'teryx's 850-fill. Its oversized hood has no adjustment cords, where the Rab Microlight Alpine Down Jacket has an adjustable hood with a wire brim.

Specs side-by-side

SpecArc'teryx Cerium Hooded Down JacketDecathlon Forclaz Simond MT100 Hooded
Fill Power850-fill goose down800-fill-power
Insulation Type850-fill goose down and Coreloft synthetic800 fill power RDS-certified down
Shell Material15D recycled Arato nylon15D polyamide
Water ResistanceDWR finishPFAS-free DWR finish
Weight11.9 oz10.3 oz
Hood TypeStormHoodoversized, non-adjustable hood
PackabilityPacks into its included stuff sack, about the size of a large cantaloupeeasily stuffs into one of the hand pockets
PocketsThree zippered pockets2 zippered hand, 1 internal drop
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