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Cumulus Aerial 250 vs Therm-a-Rest Z Lite Sol

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

Cumulus Aerial 250 is the lighter option — 25 g lighter than the Therm-a-Rest Z Lite Sol (6% less weight). If grams matter to you, that is the one to beat.
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Spec Cumulus Aerial 250 Therm-a-Rest Z Lite Sol
Weight 385 g · 0.385 kg · 0.85 lb 410 g · 0.410 kg · 0.90 lb
Brand Cumulus Therm-a-Rest
Category Sleep System Sleep System
Cumulus Aerial 250
385 g

Ultralight down sleeping bag with 900 FP goose down, single-layer design with no zipper, perfect for thru-hiking and backpacking.

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Therm-a-Rest Z Lite Sol
410 g

Classic accordion-fold foam pad. R-value 2.0. Indestructible.

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Cumulus Aerial 250 vs Therm-a-Rest Z Lite Sol: which should you buy?

If saving weight is your priority, the Cumulus Aerial 250 wins — at 385 g it is 25 g (6%) lighter than the Therm-a-Rest Z Lite Sol (410 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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