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Sea to Summit Ultralight XR Insulated (Short) vs Therm-a-Rest NeoLoft

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

Sea to Summit Ultralight XR Insulated (Short) is the lighter option — 327 g lighter than the Therm-a-Rest NeoLoft (46% less weight). If grams matter to you, that is the one to beat.
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Spec Sea to Summit Ultralight XR Insulated (Short) Therm-a-Rest NeoLoft
Weight 390 g · 0.390 kg · 0.86 lb 717 g · 0.717 kg · 1.58 lb
Brand Sea to Summit Therm-a-Rest
Category Sleep System Sleep System
Sea to Summit Ultralight XR Insulated (Short)
390 g

Ultralight insulated sleeping pad at 13.8 oz (390g) for 66-inch length with 3.6 R-value, lightest inflatable option available.

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Therm-a-Rest NeoLoft
717 g

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 Ultralight XR Insulated (Short) vs Therm-a-Rest NeoLoft: which should you buy?

If saving weight is your priority, the Sea to Summit Ultralight XR Insulated (Short) wins — at 390 g it is 327 g (46%) 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.

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