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Therm-a-Rest Vesper 20F Quilt vs Western Mountaineering Ultralite 20°F

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

Therm-a-Rest Vesper 20F Quilt is the lighter option — 130 g lighter than the Western Mountaineering Ultralite 20°F (19% less weight). If grams matter to you, that is the one to beat.
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Spec Therm-a-Rest Vesper 20F Quilt Western Mountaineering Ultralite 20°F
Weight 550 g · 0.550 kg · 1.21 lb 680 g · 0.680 kg · 1.50 lb
Brand Therm-a-Rest Western Mountaineering
Category Sleep System Sleep System
Therm-a-Rest Vesper 20F Quilt
550 g

Sleeping quilt rated to 20°F (-7°C) filled with 900-fill down, designed for ultralight three-season backpacking. Outstanding warmth-to-weight ratio.

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Western Mountaineering Ultralite 20°F
680 g

Premium 850-fill down sleeping bag rated to 20°F (-7°C).

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Therm-a-Rest Vesper 20F Quilt vs Western Mountaineering Ultralite 20°F: which should you buy?

If saving weight is your priority, the Therm-a-Rest Vesper 20F Quilt wins — at 550 g it is 130 g (19%) lighter than the Western Mountaineering Ultralite 20°F (680 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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