Sea to Summit Spark SP I 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 — 147 g lighter than the Sea to Summit Spark SP I (37% less weight). If grams matter to you, that is the one to beat.

Spec	Sea to Summit Spark SP I	Therm-a-Rest NeoAir UberLite
Weight	397 g · 0.397 kg · 0.88 lb	250 g · 0.250 kg · 0.55 lb
Brand	Sea to Summit	Therm-a-Rest
Category	Sleep System	Sleep System

Sea to Summit Spark SP I

397 g

Ultralight 850-fill down sleeping bag rated to 25°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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Sea to Summit Spark SP I 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 147 g (37%) lighter than the Sea to Summit Spark SP I (397 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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