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Exped Ultra 6.5R Medium vs Sea to Summit Ultralight XR Insulated (Short)

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

Exped Ultra 6.5R Medium is the lighter option — 36 g lighter than the Sea to Summit Ultralight XR Insulated (Short) (9% less weight). If grams matter to you, that is the one to beat.
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Spec Exped Ultra 6.5R Medium Sea to Summit Ultralight XR Insulated (Short)
Weight 354 g · 0.354 kg · 0.78 lb 390 g · 0.390 kg · 0.86 lb
Brand Exped Sea to Summit
Category Sleep System Sleep System
Exped Ultra 6.5R Medium
354 g

February 2026 launch ultralight sleeping pad; lightest three-season pad with best weight-to-warmth ratio

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Sea to Summit Ultralight XR Insulated (Short)
390 g

Ultralight insulated sleeping pad at 13.8 oz (390g) for 66-inch length with 3.6 R-value, lightest inflatable option available.

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Exped Ultra 6.5R Medium vs Sea to Summit Ultralight XR Insulated (Short): which should you buy?

If saving weight is your priority, the Exped Ultra 6.5R Medium wins — at 354 g it is 36 g (9%) lighter than the Sea to Summit Ultralight XR Insulated (Short) (390 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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