Thermarest NeoAir XTherm Max

From £198.00
£220.00
Save 10%

The XTherm™ air mattress gives the greatest warmth-to-weight ratio available in any air mattress by far, with a softer, textured no-slip fabric for better next-to-skin comfort and a quieter kip. 6.9 R-Value. Two sizes.

Thermarest NeoAir XTherm Max

Regular Vapour Grey
£198.00
£220.00
Save 10%
1 In Stock
Large Vapour Grey
£225.00
£250.00
Save 10%
2 In Stock
The XTherm™ air mattress gives the greatest warmth-to-weight ratio available in any air mattress by far, with a softer, textured no-slip fabric for better next-to-skin comfort and a quieter kip. Multiple, reflective ThermaCapture™ layers give the XTherm™ air mattress true four-season warmth without the weight or bulk usually found in a winter mattress but still 6.9 R-Value. 
  • Unmatched Warmth-to-Weight: Patent-pending, reflective Thermacapture™ technology traps radiant heat while Triangular Core Matrix™ construction minimises convective heat loss - all without the bulk, weight or durability issues of down and synthetic fills.
  • Excellent Comfort: 2.5" (6.4 cm) thickness, soft-touch fabrics and baffled internal structure provide unrivaled stability and support.
  • Highly Packable: Free of bulky, conventional insulating materials, the XTherm™ mattress packs to the size of a one-litre water bottle.
  • Ultralight: Advanced materials and a tapered design reduce weight without compromising warmth.
  • 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.

Pump sack, stuff sack and repair kit included.

Thermarest NeoAir XTherm Max R-value Dimensions Packed Weight
Regular 6.9 183cm x 51cm x 6.4cm 23cm x 10cm 490g
Large 6.9 196cm x 64cm x 6.4cm 28cm x 11cm 640g
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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