Sea to Summit Ether Light XR Insulated Regular vs Western Mountaineering Ultralite 20°F
Weight and specs compared for 2026 — and which one to choose.
Ultralight inflatable sleeping pad with air-sprung cell baffle tech; 16.6 oz for superior comfort and support
Full details →Premium 850-fill down sleeping bag rated to 20°F (-7°C).
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Sea to Summit Ether Light XR Insulated Regular vs Western Mountaineering Ultralite 20°F: which should you buy?
If saving weight is your priority, the Sea to Summit Ether Light XR Insulated Regular wins — at 470 g it is 210 g (31%) 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.