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Thermarest NeoAir XTherm Max SV

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. Available in Regular and Large .


Thermarest NeoAir XTherm Max SV Video


With Pre-Order, you can purchase the latest items added to our store in advance of them arriving with us.

You Pre-Order is prioritised (at no additional charge); meaning that, as soon as the product arrives with us, we can wrap it straight back up and get it sent out to you - it often never even hits the stock room shelves!


With Pre-Launch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Pre-Orders.

So, instead, you can submit your email address against the item you are interested in and we will email you as soon as stock arrives on the system.

Estimated Delivery Dates

Estimated Delivery Dates are given on Pre-Order and Pre-Launch products. They are for indication purposes only and can change at any time without notice.

The dates we provide are based on indications given by our suppliers. Whenever we get updated information from our suppliers we will endeavour to update the Estimated Delivery Dates provided on product pages.

The Current Estimated Delivery Dates for Thermarest NeoAir XTherm Max SV is

Thermarest NeoAir XTherm Max SV Description

  • Brand : Thermarest
  • Season : Cold!
  • Packaged Weight : 0.7KG
  • 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.

    Buyers Guide

    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)!

    Sizing Information

    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


    Technical Information

    Thermarest NeoAir XTherm Max SV
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