Nemo Tensor Ultralight vs Sea to Summit Spark SP III

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

Nemo Tensor Ultralight is the lighter option — 369 g lighter than the Sea to Summit Spark SP III (52% less weight). If grams matter to you, that is the one to beat.

Spec	Nemo Tensor Ultralight	Sea to Summit Spark SP III
Weight	340 g · 0.340 kg · 0.75 lb	709 g · 0.709 kg · 1.56 lb
Brand	Nemo	Sea to Summit
Category	Sleep System	Sleep System

Nemo Tensor Ultralight

340 g

Ultralight inflatable pad with minimal noise. R-value 3.5.

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Sea to Summit Spark SP III

709 g

850-fill down sleeping bag rated to 0°C / 32°F.

Full details →

Nemo Tensor Ultralight vs Sea to Summit Spark SP III: which should you buy?

If saving weight is your priority, the Nemo Tensor Ultralight wins — at 340 g it is 369 g (52%) lighter than the Sea to Summit Spark SP III (709 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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