Sea to Summit Camp Plus Self-Inflating Sleeping Mat

The Sea to Summit Camp Plus Self-Inflating Sleeping Mat uses an open-cell polyurethane foam core, so opening the valve does most of the inflating on its own — a few extra breaths just fine-tune firmness. An R-value of 4.3 (tested to ASTM F3340-18) puts it in the three-to-four season bracket, suitable for cooler nights beyond summer. At 7.5 cm thick, body-mapped foam zones vary firmness across the pad to reduce the hip and shoulder sag common on thinner mats. That comfort comes at a weight of 880 g in the Regular size (183 × 51 cm) and a packed volume of 16 × 26 cm — notably bulkier than a pure air pad with the same R-value. Top and bottom fabric is 75D recycled polyester with TPU lamination for puncture resistance, and the package includes a repair kit and stuff sack. A quiet, non-crinkly surface and no need for a pump make it a practical choice for base camps and car camping, where the extra grams matter less than a reliably comfortable night.