Thermarest ProLite Apex

From £153.00
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A much improved Thermarest Prolite Plus that is thicker and warmer for the same sort of weight and bulk when rolled up. 3.8 R-Value.

Thermarest ProLite Apex

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A much improved Thermarest Prolite Plus that is thicker and warmer for the same sort of weight and bulk when rolled up.
Top of the range self-inflating mat, the Apex is the pinnacle of light and stable self-inflating comfort.
Thermarest have succeeded in adding warmth and thickness without adding additional weight due to its unique StrataCore construction which inflates to 2" thick. 
  • 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: Perfect for everything from winter adventures to summer backpacking.
  • Comfy Self-inflating Foam: Expanding foam core self-inflates; top off with air for personalised firmness on 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.
  • WingLock™ Valve is intuitive and dependable and maximises air flow for easier inflation and quicker deflation. Wings toggle for one-way inflation to save breath.

Stuff sack included.

Thermarest Prolite Apex R-Value Dimensions Packed Weight
Regular 3.8 183cm x 51cm x 5cm 28cm x 18cm 620g
Large 3.8 196cm x 63cm x 5cm 33cm x 17cm 850g

Togs and R Values: Typically used in the British textile industry, one Tog corresponds to the heat insulation capability of clothing etc which maintains a temperature difference of 0.1°Kelvin while passing a heat flux of 1 Watt/m2*. Some manufacturers (mainly US ones) give an R Value for the insulation properties of their mats. By this they mean an imperial equivalent (°F-ft2-h/Btu). To convert Imperial R values to Togs, multiply by 1.76228. To confuse matters there is also a metric R value, more properly called an RSI value (10 Togs = 1 RSI).

The higher the Tog or R (or RSI) value the better the insulation provided.

If you aren't totally confused by the above you should add to the mix that testing for R/Tog/RSI ratings is not by any means an exact science and that it is also expensive so, it is alleged, some figures that are given may be acquired by doing little more than taking a competitor's figure and adding a pinch for good measure. Of course, who is alleging what about whom is also not easy to ascertain!

*NB One Tog was originally a war time measurement of the amount of warmth retained by a typical male wearing a three piece suit - it originated from research done in the North of England - hence the term tog (though this in turn is thought to originate from the Roman word toga)!

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