Sea to Summit Comfort Plus Self-Inflating Sleeping Mat

The Sea to Summit Comfort Plus Self-Inflating Sleeping Mat uses an open-cell PU foam core, an ASTM R-value of 4.1, and 7.6 cm of thickness — the thickest self-inflating profile in this batch of S2S mats. That extra foam brings more insulation and cushioning, but also more weight: in regular size it comes in at 970 g, noticeably heavier than air-only pads with comparable R-values. A multi-function valve simplifies inflation and deflation, and the Pillow Lock attachment lets you clip an S2S pillow directly to the mat so it doesn't slide during the night. The top fabric is a stretch 30D polyester knit, comfortable against skin without a sheet. An unusually long 99-year warranty signals real confidence in the foam core's durability. This is a mat for campers who prioritize sleep comfort and simple setup over shaving weight — think car camping, hut-based trips, or shorter treks where pack weight is less of a constraint.