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Sea to Summit Ultralight Insulated vs Western Mountaineering Versalite 10°F

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

Sea to Summit Ultralight Insulated is the lighter option — 255 g lighter than the Western Mountaineering Versalite 10°F (30% less weight). If grams matter to you, that is the one to beat.
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Spec Sea to Summit Ultralight Insulated Western Mountaineering Versalite 10°F
Weight 595 g · 0.595 kg · 1.31 lb 850 g · 0.850 kg · 1.87 lb
Brand Sea to Summit Western Mountaineering
Category Sleep System Sleep System
Sea to Summit Ultralight Insulated
595 g

Insulated inflatable pad with R-value 3.7.

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Western Mountaineering Versalite 10°F
850 g

850-fill down sleeping bag rated to 10°F (-12°C).

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Sea to Summit Ultralight Insulated vs Western Mountaineering Versalite 10°F: which should you buy?

If saving weight is your priority, the Sea to Summit Ultralight Insulated wins — at 595 g it is 255 g (30%) lighter than the Western Mountaineering Versalite 10°F (850 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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