Sea to Summit Comfort Light Insulated Sleeping Mat - Large

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We're working out what we think about Sea to Summit's 2020 Comfort Light Insulated Sleeping Mat - Large, we'll add our comments here in due course.

- Reviewed by Ultralight Outdoor Gear

Help and advice:

• Air Sprung Cells™ conform to your body shape, providing a more even dispersion of pressure across the mattress for a more comfortable nights sleep
• Multi-function high flow-rate valve provides fast inflate, deflate and easy fine-tuning for personalised comfort
• Ultra-Fresh® anti-microbial treatment to the TPU formula to prevent internal mould growth
• Includes an Airstream™ Pump that is integrated into the stuff sack for quick and easy inflation
• Includes a repair kit for easy puncture repair in the field
• Included Pillow Lock™ system attaches Sea to Summit pillows to mat

• Weighs: 754g (excludes bag/pumsack)
• Airstream pumpsack/storage bag weighs: 56g
• Dimensions: 201 x 64 x 6.3cm
• Packed size: 11.5 x 26cm
• ASTM R-Value: 3.7

ASTM R-Value:

From 2020, there is a new industry standard for measuring the R-value (level of insulation) of sleeping mats – ASTM F3340-18. This new standard is the sleeping mat equivalent to the EN rating for sleeping bags.

You can now directly compare the R-value of mats rated using the ASTM F3340-18 with confidence that is a fair and accurate comparison between mats. In simple terms, the higher the R-value, the warmer the mat.

In general terms, an R-value below 2.0 is for summer use, 2.0 to 4.0 is for cooler 3 season use and 4.0+ is for winter temperatures. This will be also be dependent on your sleeping bag, how cold you sleep etc. Please contact our customer service team if you need advice on choosing the right mat for your activity.