Thermarest NeoAir XTherm NXT Max Sleeping Mat

From £252.00
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Super lightweight rectangular air mattress that has to be seen to be believed. 7.3 R-Value. Two sizes.

Thermarest NeoAir XTherm NXT Max Sleeping Mat

Neptune Regular Wide
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1 In Stock
Neptune Large
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Out of Stock


A rectangular version of the Thermarest XTherm NXT. With cutting edge Triangular Core Matrix™ construction and ThermaCapture™ technology, the Thermarest XTherm NXT Max boasts an incredible 7.3 R-value. It is warmer, lighter and thicker than the previous model, which is why the XTherm NXT is likely to become the basecamp mat of choice for alpinists, mountaineers and extreme cold expeditions. At 7.6cm (3") thick, with horizontal baffles, all-night warmth, comfort and support are pretty much guaranteed, while 70D nylon on the bottom ensures the XTherm NXT Max holds up to extended expedition use. The WingLock™ Valve allows for rapid inflation and deflation but is also intuitive and easy to use in icy weather when it's best not to take your gloves off. If reliable overnight warmth is the demand no matter how far the mercury dips and space in your rucksack is at a premium, this could be the answer to your dreams.

  • Refined Triangular Core Matrix™ construction and ThermaCapture™ technology deliver a cold-conquering 7.3 R value.
  • 3" (7.6cm) thick profile and horizontal baffled structure provides premium comfort while keeping the weight to a minimum.
  • 70D nylon on the bottom withstands the wear and tear of extended expedition use, while 30D ripstop nylon on top keeps it light and packable.
  • WingLock™ Valve gives fast one-way inflation and rapid deflation without giving up the ability to easily purge air while you lay on it for comfort micro-adjustments - even with gloves on.

Pump sack, stuff sack and repair kit included.

It comes in two large sizes suitable for basecamp use.

Thermarest NeoAir XTherm NXT Max R-value Dimensions Packed Weight
Regular Wide 7.3 183cm x 64cm x 7.6cm 28cm x 13cm 650g
Large 7.3 196cm x 64cm x 7.6cm 28cm x 13cm 680g

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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