Therm-a-Rest Parsec 20F vs Western Mountaineering AstraLite
Weight and specs compared for 2026 — and which one to choose.
Updated 2026 ultralight 3-season sleeping bag with 900-fill Muscovy hydrophobic down. Comfort rating -6°C. Refined baffles for improved loft and simplified inte...
Full details →Ultralight 3-season sleeping bag with 850fp down and 12D shell. Designed for fast-and-light alpine pursuits and long trail journeys.
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Therm-a-Rest Parsec 20F vs Western Mountaineering AstraLite: which should you buy?
If saving weight is your priority, the Western Mountaineering AstraLite wins — at 496 g it is 324 g (40%) lighter than the Therm-a-Rest Parsec 20F (820 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.