Sea to Summit Comfort Plus Insulated Air Sleeping Mat

The Sea to Summit Comfort Plus Insulated Air Sleeping Mat is a bulkier air pad built around dual-chamber Air Sprung Cells and an ASTM F3340-18 R-value of 4.0, putting it on the boundary between 3- and 4-season use. Insulation comes from a reflective Exkin Platinum layer combined with synthetic Thermolite HL-1 rather than down, so performance stays consistent even if the pad gets damp. In regular size it weighs 845 g and, at 6.3 cm thick, offers noticeably more cushioning than the lighter Comfort Light line. Both face fabrics get an anti-microbial TPU lamination, a pump sack and repair kit are included, and the pad is designed to be quiet underfoot. A warmth-to-weight ratio of 4.73 signals this is a comfort-first pad rather than an ultralight one — a reasonable choice for weekend trips or longer treks where sleep quality matters more than shaving off the last few grams.