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REI Co-op Magma 850 Down Jacket vs Senchi Designs A90 Half-Zip Hoodie

Weight and specs compared for 2026 — and which one to choose.

Senchi Designs A90 Half-Zip Hoodie is the lighter option — 228 g lighter than the REI Co-op Magma 850 Down Jacket (62% less weight). If grams matter to you, that is the one to beat.
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Spec REI Co-op Magma 850 Down Jacket Senchi Designs A90 Half-Zip Hoodie
Weight 370 g · 0.370 kg · 0.82 lb 142 g · 0.142 kg · 0.31 lb
Brand REI Co-op Senchi Designs
Category Clothing - Mid Layer Clothing - Mid Layer
REI Co-op Magma 850 Down Jacket
370 g

Responsible down 850-fill jacket at excellent value.

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Senchi Designs A90 Half-Zip Hoodie
142 g

Active insulation mid-layer using Polartec Alpha Direct 90, delivering outstanding warmth-to-weight ratio and breathability for aerobic output.

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REI Co-op Magma 850 Down Jacket vs Senchi Designs A90 Half-Zip Hoodie: which should you buy?

If saving weight is your priority, the Senchi Designs A90 Half-Zip Hoodie wins — at 142 g it is 228 g (62%) lighter than the REI Co-op Magma 850 Down Jacket (370 g). That said, the heavier option may justify the extra grams with more capacity, durability or comfort, so weigh the trade-off against how you'll use it.

See where both rank against everything else in this category on the lightest clothing - mid layer page, or browse the full gear weight database.

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