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Exped SynMat HL Winter vs Sea to Summit Spark Pro Down Sleeping Bag

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

Exped SynMat HL Winter is the lighter option — 85 g lighter than the Sea to Summit Spark Pro Down Sleeping Bag (11% less weight). If grams matter to you, that is the one to beat.
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Spec Exped SynMat HL Winter Sea to Summit Spark Pro Down Sleeping Bag
Weight 680 g · 0.680 kg · 1.50 lb 765 g · 0.765 kg · 1.69 lb
Brand Exped Sea to Summit
Category Sleep System Sleep System
Exped SynMat HL Winter
680 g

4-season inflatable pad with R-value 8.0.

Full details →
Sea to Summit Spark Pro Down Sleeping Bag
765 g

Ultralight down sleeping bag at 765g with 900+ fillpower RDS-certified down, 15°F rating and Free-Flow Zip system for versatility.

Full details →

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Exped SynMat HL Winter vs Sea to Summit Spark Pro Down Sleeping Bag: which should you buy?

If saving weight is your priority, the Exped SynMat HL Winter wins — at 680 g it is 85 g (11%) lighter than the Sea to Summit Spark Pro Down Sleeping Bag (765 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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