Marmot Hydrogen 30°F vs Therm-a-Rest NeoLoft

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

Marmot Hydrogen 30°F is the lighter option — 8 g lighter than the Therm-a-Rest NeoLoft (1% less weight). If grams matter to you, that is the one to beat.

Spec	Marmot Hydrogen 30°F	Therm-a-Rest NeoLoft
Weight	709 g · 0.709 kg · 1.56 lb	717 g · 0.717 kg · 1.58 lb
Brand	Marmot	Therm-a-Rest
Category	Sleep System	Sleep System

Marmot Hydrogen 30°F

709 g

Ultralight 800-fill down sleeping bag rated to 30°F.

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Therm-a-Rest NeoLoft

717 g

Plush 10cm-thick insulated air pad with R-value 4.7, designed for car-camping-level comfort at a backpackable weight.

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Marmot Hydrogen 30°F vs Therm-a-Rest NeoLoft: which should you buy?

If saving weight is your priority, the Marmot Hydrogen 30°F wins — at 709 g it is 8 g (1%) lighter than the Therm-a-Rest NeoLoft (717 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 sleep system page, or browse the full gear weight database.

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