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Katabatic Gear Flex 15°F Quilt vs Sea to Summit Ether Light XT

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

Sea to Summit Ether Light XT is the lighter option — 288 g lighter than the Katabatic Gear Flex 15°F Quilt (40% less weight). If grams matter to you, that is the one to beat.
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Spec Katabatic Gear Flex 15°F Quilt Sea to Summit Ether Light XT
Weight 723 g · 0.723 kg · 1.59 lb 435 g · 0.435 kg · 0.96 lb
Brand Katabatic Gear Sea to Summit
Category Sleep System Sleep System
Katabatic Gear Flex 15°F Quilt
723 g

Lightweight three-season quilt with 900 fill power goose down, patented pad attachment system, and down-filled collar. Regular size (6'), includes stuff sack an...

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Sea to Summit Ether Light XT
435 g

Ultralight air sleeping pad with 3D construction for comfort.

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Katabatic Gear Flex 15°F Quilt vs Sea to Summit Ether Light XT: which should you buy?

If saving weight is your priority, the Sea to Summit Ether Light XT wins — at 435 g it is 288 g (40%) lighter than the Katabatic Gear Flex 15°F Quilt (723 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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