Sea to Summit Spark Pro Down 30 vs Therm-a-Rest NeoLoft
Weight and specs compared for 2026 — and which one to choose.
Ultralight mummy bag rated to 30F (-1C) with 950+ fill-power Ultra-Dry Down. 10-denier shell, shoulder and footbox zippers for temperature control.
Full details →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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Sea to Summit Spark Pro Down 30 vs Therm-a-Rest NeoLoft: which should you buy?
If saving weight is your priority, the Sea to Summit Spark Pro Down 30 wins — at 619 g it is 98 g (14%) 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.