Moutain Spring 燕 Yan Ultralight Folding Mattress

Mountain Spring’s Yan (燕) Series foldable mattress is built for ounce-counters who won’t compromise on function. Weighing as little as 103 g, it delivers meaningful ground insulation in a nearly weightless package—ideal on its own for minimalist trips or as a protective, warmth-boosting layer under an inflatable pad with barely any penalty in your pack. The closed-cell design shrugs off moisture, resists tears, and stays reliable in rough conditions. Fresh glacier-inspired colors add high visibility and a clean, modern look on trail.

Upgraded IXPP foam enhances durability and comfort with low thermal conductivity to blunt heat loss to the ground and help keep the surface dry and comfortable. Multiple sizes let you dial in coverage for sit-pad simplicity or full-length sleep. Ultralight, waterproof, and tough—this is a high warmth-to-weight base that works anywhere.