Thermarest NeoAir XTherm Max SV

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The NeoAir XTherm air mattress gives the greatest warmth-to-weight ratio available in any air mattress by far. An amazing 5.7 R-Value! SpeedValve™ inflation/deflation.

Thermarest NeoAir XTherm Max SV

Save 10%
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The NeoAir XTherm air mattress gives the greatest warmth-to-weight ratio available in any air mattress by far, with a new, softer, textured no-slip fabric for better next-to-skin comfort and a quieter rest. Multiple , reflective ThermaCapture™ layers give the XTherm air mattress true four-season warmth without the weight or bulk usually found in a winter camping mat - an amazing 5.7 R-Value!  This Max version is the same mat, though cut square rather than rounded to body shape and is the latest, SV version. SV stands for SpeedValve™ an extraordinary infaltion system which halves the time needed to inflate or deflate the mat. Available in Regular and Large versions.
  • An amazing 5.7 US R-Value (10 Tog).
  • 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: 6cm (2.5)-thickness, new, soft-touch fabrics and baffled internal structure provide unrivalled stability and support. 
  • SpeedValve™ inflation/deflation.
  • 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.

Stuffsack included.

Thermarest NeoAir XTherm Max SV Dimensions Packed Weight
Regular 183cm x 51cm x 6.3cm 20cm x 12cm 580g
Large 196cm x 63cm x 6.3cm 24cm x 13cm 740g


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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