Sea to Summit Sleeping Mat

An R-Value of 2.9 indicates this mat is well-suited for three-season use, meaning it provides sufficient insulation for spring, summer, and early autumn conditions. It is designed to keep you comfortable in temperatures down to roughly freezing, but it is not intended for deep winter or snow camping.

Delta Core-V technology involves removing specific sections of the internal foam to reduce weight and bulk without sacrificing support. By keeping more foam in high-pressure areas like the hips and feet, it maintains warmth and cushioning where you need it most while shedding ounces elsewhere.

It is a self-inflating mat, meaning the open-cell foam core will expand and draw in air on its own once you open the valve. While it will inflate most of the way by itself, most users prefer to add a few breaths of air at the end to reach their preferred firmness.

Unlikely. The surface features a silicone print pattern specifically designed to create friction, which helps keep your sleeping bag securely in place throughout the night, even if you toss and turn.

PillowLock is a series of hook-and-loop patches on the mat that secure compatible Sea to Summit pillows in place so they don't migrate while you sleep. While it works best with Sea to Summit pillows, you can use any pillow with the mat; it just won't 'lock' into place.

The Regular size is 67 inches long, which is generally sufficient for hikers up to 5'6". If you are taller than that, or if you prefer extra room to sprawl, the 72-inch Large size is the better choice.