Ultralight XR Insulated Air Sleeping Mat

ThermalCore insulation

ThermalCore insulation uses a single or multiple layers of TRM material to reflect warmth back to the sleeper. The TRM layers reduce internal air movement, and the smaller die cuts, compared to prior models, reduce this further still. The result is a significant increase in both R-Value and in real-world insulation performance, while reducing weight and packed volume.

ASTM R-VALUE

To create a sleep system appropriate for anticipated conditions (especially when the ground is colder), it is essential to know how well a sleeping mat resists heat loss into the ground. This resistance is known as an R-Value. Sea to Summit has always provided independent lab-tested R-Values for its sleeping mats. Since January 2020 we have used the industry standard ASTM F3340 test. Other factors determine how well a sleeping mat will insulate; but the standardised ASTM test is a good starting point for comparing performance across brands.  Not all published R-Values are lab tested. Look for the 'ASTM F3340' icon - if this is not present, it is likely that the R-Value has been estimated.

XPRESS valve

Sea to Summit developed the XPRESS valve to make inflation, deflation and adjustment of its air mats quicker and simpler than conventional air mats. The valve integrates a one-way inflate port, a rapid dump deflate port and a fine-tune button into a single, low-profile unit. The XPRESS valve fits the nozzle of the Airstream pump integrated into the stuff sack supplied with your Sea to Summit Air Sprung Cell sleeping mat.

(Pro Tip - turn the inflator bag of the sleeping mat pump inside out to reveal a nozzle sized perfectly for the mini-XPRESS valve of an Aeros Pillow.)

Liquid-extruded TPU lamination

The name sounds complicated, but the process is really simple. Instead of rolling a film onto a fabric to make it airproof, liquid urethane is forced through a controlled gap in a lamination head where it works its way into the crevices between the yarns. This results in a permanent bond - with an incredible level of reliability. Sea to Summit was the first company to pioneer this technology in sleeping mats - and continues to insist on a laminating thickness that results in stable, long-lasting welds.

Airstream Pumpsack

The Airstream Pumpsack is Sea to Summit's big volume mattress pump which we've now integrated into the stuff sack of every Air Sprung Cell mat. The clever design opens at one end to stow the air mat and the other end unfolds to become the built-in pump. The Airstream Pumpsack can be inflated with a single breath and takes just two or three cycles to fill our mats. Not only is it faster than inflation by mouth, but there is minimal breath condensation entering the mat and it eliminates dizziness from blowing the mat up directly by mouth. The Airstream Pumpsack is also compatible with Sea to Summit's smaller multifunction valve, which is now featured on the updated Aeros pillow range, along with the Air Seats.

PILLOWLOCK SYSTEM

The Pillow Lock System comprises of self-adhesive hook-and-loop patches which are supplied with all Sea to Summit Aeros Pillows (as of Spring 2026). Attached to your sleeping mat, these patches secure your pillow and prevent it slipping. All Sea to Summit Pillows (as of Spring 2019) are compatible with this system.