Thermarest ProLite Plus

From £85.50
£95.00
Save 10%

Four season 3.8 cm thick inflatable mat which combines outstanding all-season warmth with the convenience of self-inflation. US R value is 3.4 (= 6.0 Tog). Two lengths and Women's.

Thermarest ProLite Plus

Regular
£90.00
£100.00
Save 10%
2 In Stock
Small
£85.50
£95.00
Save 10%
2 In Stock
Women's
£90.00
£100.00
Save 10%
1 In Stock

Four season 3.8 cm thick inflatable mat which combines outstanding all-season warmth with the convenience of self-inflation. An upgrade to the exclusive Atmos™ Foam reduces weight and boosts compressibility. In addition, patent-pending diagonal-cut foam delivers more warmth than the more common vertical channels, making it the ideal choice for ski touring, cold weather expeditions and winter camping.

  • Lighter: Atmos™ Foam reduces weight by nearly 10%.
  • Four-Season Warmth: Thick, patent-pending diagonal-cut foam offers efficient year-round comfort.
  • Ultra-Compact: Atmos Foam boosts compressibility for easy packing.
  • Self-Inflating: Expanding foam core self-inflates; top off with just a few breaths for personalised firmness.

US R value is 3.4 (= 6.0 Tog), though, due to clever design, the Women's is a little warmer.

Stuff sack included.

Thermarest Prolite Plus Dimensions Packed Weight R Value
Regular 183cm x 51cm x 3.8cm 28cm x 12cm 570g 3.4
Small 119cm x 51cm x 3.8cm 28cm x 10cm 400g 3.4
Women's 168cm x 51cm x 3.8cm 28cm x 10cm 570g 4.2
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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