Sea to Summit Comfort Deluxe SI Double

Sea to Summit's Comfort Deluxe SI Double is an ultra-comfortable, insulated 10 cm thick self-inflating mattress for 2 people. Insulated for 4-season use, its R-Value is 6.5 according to ASTM F3340-18.

It is designed with Delta Core technology, which maximizes mattress comfort and thickness while minimizing weight and bulk:

• large horizontal and triangular inserts reduce weight and bulk without compromising comfort and support.


• PU foam is thicker at the top of each Delta Core insert for better insulation directly on the body.

Materials are robust and durable:

• 30-denier stretch fabric on the sleeping side, pleasant to the touch,


• on the ground side, robust and durable 75D polyester fabric with TPU coating.

The Comfort Deluxe SI features a unique valve with non-return valve (inflation/deflation). This enables rapid inflation and efficient deflation. The non-return valve prevents the mattress from re-inflating during folding, and can be used to manage pressure.

The practical silicone pattern on the ground side prevents the mattress from slipping and ensures a perfect grip on the ground.