Outdoor Vitals Ultralight Sleeping Pad Mummy

The mummy-shaped sibling of Outdoor Vitals' Ultralight Sleeping Pad trims weight further by tapering the footprint to match a sleeping bag's outline. It carries the same R-value of 4.0 (again on the brand's legacy scale rather than ASTM F3340) and 8.9 cm of thickness as the rectangular version, but the tapered cut brings regular-size weight down to 454 g — about 56 g lighter than the rectangular pad at the same length and width. Construction stays consistent with the rest of the line: a 20D ripstop polyester shell on top and bottom, no foam core, and a compatible pump sack included to inflate the pad without moisture-laden breath. The resulting R-value-to-weight ratio of roughly 8.8 is a genuine step up over the rectangular pad, though the mummy shape means less room to shift position overnight and slightly less margin if you tend to roll off-pad. This is a pad for ultralight backpackers and thru-hikers chasing every gram of base weight who are comfortable trading sleeping-surface width for warmth per gram.