Thermarest ProLite Plus (with WingLock Valve)

From £90.00
£100.00
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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). The new “WingLock™ Valve” is intuitive and maximises air flow for easier inflation and quicker deflation. The “Wings” toggle for one-way inflation to save breath. Two lengths and Women's.

Thermarest ProLite Plus (with WingLock Valve)

Cayenne Regular
£99.00
£110.00
Save 10%
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Cayenne Women's
£99.00
£110.00
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1 In Stock
Cayenne Short
£90.00
£100.00
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1 In Stock

Four season 3.8 cm thick inflatable mat which combines outstanding all-season warmth with the convenience of self-inflation. Lightweight 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.

  • Four-Season Warmth: Thick, patent-pending diagonal-cut foam offers efficient year-round comfort.
  • Ultra-Compact: Lightweight Foam boosts compressibility for easy packing.
  • Self-Inflating: Expanding foam core self-inflates; top off with just a few breaths for personalised firmness.
  • The new “WingLock™ Valve” is intuitive and maximises air flow for easier inflation and quicker deflation. The “Wings” toggle for one-way inflation to save breath.
  • Stuff sack included.

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

Thermarest Prolite Plus Dimensions Packed Weight R Value
Regular 183cm x 51cm x 3.8cm 28cm x 12cm 650g 3.4
Small 119cm x 51cm x 3.8cm 28cm x 10cm 450g 3.4
Women's 168cm x 51cm x 3.8cm 28cm x 10cm 640g 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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