Thermarest ProLite Apex Large Sleeping Mat

ASTM R-Value: Not Quoted / Dimensions: 196 x 63 x 5cm / Packed Size: 33 x 13cm
Weighs 858g (excluding bag)
Code: SS19110
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Thermarest's Prolite Apex self inflating mats have the best warmth to weight ratio of any self inflating mattress thanks to the StrataCore insulation foam technology. This also keeps weight and pack size to a minimum.  

Therm-a-rest says:

Boasting an unrivaled warmth-to-weight ratio, the Apex is the pinnacle of light and stable self-inflating comfort.

The newest addition to our tried-and-true ProLite family adds warmth and thickness without adding additional weight. The lightweight Apex offers year-round warmth and comfort thanks to its unique StrataCore construction. The two-inch thick mattress ensures that you stay comfy during your backcountry backpacking and camping adventures. Stuff sack included.

Therm-a-Rest's ProLite Apex Regular Sleeping Mat is '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. This mat self inflated quickly and the 5cm thickness combined with the internal foam gives a comfy and supportive mat.

Self inflating mats have foam sandwiched between two outer fabric layers. The high quality outer fabric is soft to the touch and tough at 50 denier. The foam inside is also high quality that will survive repeated compression cycles and the valve has been tried and tested over many years.

Self inflating mats are considered to be more durable  than insulated air beds though not a slight  and if you do get a puncture you still have a layer of foam to lie on - with airbeds you would have nothing. The stuff sack has compression straps to minimise pack size.

- Reviewed by Ultralight Outdoor Gear

Help and advice:
  • StrataCore™ Construction: Yielding the best warmth-to-weight ratio of any self-inflating mattress, StrataCore uses a continuous layer of thermal foam nestled between alternating ridges of air and foam.
  • Lightweight Year-Round Comfort: The best warmth-to-weight ratio of any self-inflating mattress.
  • Comfy Self-inflating Foam: Expanding foam core self-inflates; top off with air for personalized firmness on 2 in (5 cm) of StrataCore loft.
  • Easily Fits In Your Pack: Packs down small to easily find a place in your pack during fast and light adventures.
  • Weight: 858g (excludes storage bag)
  • Dimensions: 63 x 196cm
  • Thickness: 5cm
  • Packed size: 33 x 13cm
  • ASTM R-Value: Not Quoted
  • Old R-Value test: 4.0 (US) / 0.70 (SI)
  • Fabric: 50D Polyester

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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