Marmot Plasma 15°F vs Therm-a-Rest NeoAir UberLite

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

Therm-a-Rest NeoAir UberLite is the lighter option — 600 g lighter than the Marmot Plasma 15°F (71% less weight). If grams matter to you, that is the one to beat.

Spec	Marmot Plasma 15°F	Therm-a-Rest NeoAir UberLite
Weight	850 g · 0.850 kg · 1.87 lb	250 g · 0.250 kg · 0.55 lb
Brand	Marmot	Therm-a-Rest
Category	Sleep System	Sleep System

Marmot Plasma 15°F

850 g

800-fill down sleeping bag rated to 15°F (-9°C).

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Therm-a-Rest NeoAir UberLite

250 g

Lightest NeoAir pad. R-value 2.0 for warm conditions.

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Marmot Plasma 15°F vs Therm-a-Rest NeoAir UberLite: which should you buy?

If saving weight is your priority, the Therm-a-Rest NeoAir UberLite wins — at 250 g it is 600 g (71%) lighter than the Marmot Plasma 15°F (850 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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