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Thermarest ProLite Apex

A much improved Thermarest Prolite Plus that is thicker and warmer for the same sort of weight and bulk when rolled up. 


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  • Regular
  • £112.50
  • 1 in stock
  • Check Store Availability
  • Large
  • £130.50
  • 1 in stock
  • Check Store Availability
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Thermarest ProLite Apex 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 ProLite Apex is

Thermarest ProLite Apex Description

  • Brand : Thermarest
  • Season : Not Applicable
  • Code : CAS PLAPEX
  • Packaged Weight : 0.72KG
  • A much improved Thermarest Prolite Plus that is thicker and warmer for the same sort of weight and bulk when rolled up.
    Top of the range self-inflating mat, the Apex is the pinnacle of light and stable self-inflating comfort.
    Thermarest have succeeded in adding warmth and thickness without adding additional weight due to its unique StrataCore construction which inflates to 2" thick. Stuff sack included.
    • StrataCore™ Construction: Yielding the best warmth-to-weight ratio of any self-inflating mattress, StrataCore uses a continuous layer of thermal foam nestled between alternating ridges of air and foam.
    • Lightweight Year-Round Comfort: Perfect for everything from winter adventures to summer backpacking.
    • Comfy Self-inflating Foam: Expanding foam core self-inflates; top off with air for personalised firmness on (5 cm) of StrataCore loft.
    • Easily Fits In Your Pack: Packs down small to easily find a place in your pack during fast and light adventures.

    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 Prolite Apex R Value Dimensions Packed Weight
    Regular 4* 183cm x 51cm x 5cm 28cm x 12cm 630g
    Large 4* 196cm x 63cm x 5cm 33cm x 13cm 850g

    * As opposed to 3.4 for a Prolite Plus and 2.4 for a Prolite.

    Technical Information

    Thermarest ProLite Apex
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