Sea to Summit Comfort Light Insulated Air Sleeping Mat

The Sea to Summit Comfort Light Insulated Air Sleeping Mat is a 3-season inflatable pad rated R-3.7 under ASTM F3340-18 — enough insulation for spring through autumn, but without a real margin for freezing nights. Its 6.3 cm loft comes from the Air Sprung Cells construction, backed by a reflective Exkin Platinum layer and synthetic Thermolite HL-1 fill, giving a reasonable warmth-to-weight ratio of 5.78 without any down. In regular size it weighs 640 g and rolls down to 23×11 cm, small enough to disappear into a pack. Both face fabrics carry an anti-microbial TPU lamination, which should help keep odor and mildew in check over repeated multi-day use. A pump sack and repair kit come included, useful on trips far from a gear shop. Backed by a 10-year warranty and cut in a tapered mummy shape to save weight at the edges, it's a solid pick for hikers who want the comfort of an air pad without paying the weight penalty of a heavier all-season model.