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Thermarest Prolite Large Self Inflating Mat

ASTM R-Value: Not Quoted / Dimensions: 196 x 63 x 2.5cm / Packed Size: 33 x 11cm
Weighs 778g
Code: SS15121
  • Now £84.99
  • (FREE Delivery on orders over £15)
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Thermarest's Prolite and Prolite Plus series of self inflating mats offer comfort and insulation with new foam technology keeping weight and packsize to a minimum.

Thermarest says: Updated - Now featuring our exclusive Atmos Foam to further reduce weight and boost compressibility, the ProLite is the lightest and most compact three-season mattress available.

Self-inflation keeps set-up super-easy and its die-cut foam packs small, easily fitting inside the most ultralight packs. It’s ideal for high-mileage, high-speed journeys where every gram counts. Stuff sack included.

Diagonally Die-cut Foams

Pioneered by Therm-a-Rest, this technology works on the same principal as our vertically die-cut foams, lowering overall mattress density to reduce weight and increase packability. However, cut at an angle, these die-cuts decrease the direct, vertical flow of air between the ground and the top of the mattress, resulting in warmer mattress with similar weight and compressibility benefits.

Thermal Foams

Thermal Foam is our proprietary, solid-core foam. While it may look like just foam, we have spent decades working closely with our supplier, evolving this most basic element of our self-inflating pads. The resulting foam is made in the USA, and optimized for the best balance of light weight, lasting durability, and uniformity of support.

Thermarest's Prolite and Prolite Plus mats are 'self inflating', that is, you open the valve and leave it to slowly suck air into it and inflate. You usually have to add a few breaths by mouth at the end and then close the valve...and sleep.

Self inflating mats have foam sandwiched between two outer fabric layers. The fabric is soft to the touch and quite tough - not all self inflating mats are the same, the Prolite series are a premium product, this is manifested by the high quality outer fabrics which don't slide about the tent as much as others, the foam inside is also high quality that will survive repeated compression cycles and the valve has been tried and tested over many years.

The Prolite Plus mats are thicker than the Prolite - that means they're more comfortable, but also heavier with a smaller packed size.

Whilst not being as comfortable as insulated airbeds self inflating mats are considered to be more durable - and if you do get a puncture you still have a layer of foam to lie on - with airbeds you would have nothing.

- Reviewed by Ultralight Outdoor Gear

Help and advice:

  • Lightweight: The lightest self-inflating mattress available.
  • Compact Warmth: Diagonal-cut foam and tapered shape provides efficient warmth with limited bulk.
  • Highly Packable: Our exclusive Atmos Foam and a tapered shape keep the ProLite mattress extremely pack friendly.
  • Self-Inflating: Expanding foam core self-inflates; top off with just a few breaths for personalized firmness.
  • Download Self Inflating Mattress Instructions & Warranty [PDF]
  • Dimensions: 63 x 196cm
  • Packed Size: 33 x 11cm
  • Weighs 778g
  • Thickness 2.5cm
  • ASTM R-Value: Not Quoted
  • Old R-Value test: (US) 2.4 / 0.42 (SI)

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.

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