Exped SynMat HL Winter LW Long Extra Wide Sleeping Mat

ASTM R-Value: 5.2 / Dimensions: 197 x 65 x 9cm / Packed Size: 25 x 12cm
Weighs 586g (excluding bag)
Code: SS17311
  • £149.99
  • (FREE Delivery on orders over £15)
  • RRP £164.99
Item out of Stock | Usually dispatched within 24 hours

Exped's SynMat HL Winter mats are rated to minus 18C yet are very lightweight and comfortable, packed size is also very small - although designed for winter use the 9cm thickness adds comfort and the additional insulation means you can pack a lighter sleeping bag.

Exped says: SynMat HL Winter is designed to be the lightest 4-season sleeping mat on the planet. Tapered design, 20 denier fabric, microfiber insulation and 9 cm thickness create a balance of features that respect the most weight and bulk conscious winter campers. This mat also offers the warmth needed for cold sleepers in spring and summer conditions. It packs to an extremely small size and it's tapered profile fits into the smallest tents. 

Next-to-skin comfort and anti-slip GripSkin honeycomb-pattern coating. Laminate is air tight and impervious to hydrolysis. 

Clever Pumpsack included: The Schnozzel Pumpbag allows you to inflate the mat instantly while preventing humidity from your breath affecting the insulation. It also doubles as an ultra lightweight compression stuffsack.

Exped's SynMat HL Winter Sleeping Mats are insulated airbeds. Airbeds are easily the most comfortable camping mats available and its only in recent years that they have been made light enough for backpackers, airbeds with insulation go a step further and keep you warmer - this enhances the performance of your sleeping bag and in my view is well worth the extra weight, though you need to match the quality of insulation to the conditions you are likely to encounter.

Exped rates the Synmat HL Winter mats for use in temperatures down to minus 20C - of course it can be used in even lower temperatures but Exped are saying there are better products for colder conditions - but minus 18C is pretty cold, and probably the lowest you would experience in the UK.

Weight and pack size are extremely good, the Synmat HL Winter mats are 9cm thick which contributes to its enhanced insulation value - but also makes it a bit more comfortable than the standard 7cm mats. It has slightly enlarged baffles along each side to help keep you centred on the mat. They are mummy shaped mat - the very lightest mats are mummy shaped to save weight, some people prefer rectangular mats because they are easier to stay on but if that isn't a problem for you then the HL mat is a better option because its lighter.

There's a single valve for inflation and deflation which also minimises weight. The Synmat HL Winter is a good choice if you are looking for additional comfort or a mat you can use all year round, including winter.

- Reviewed by Ultralight Outdoor Gear

Help and advice: 
  • The lightest 4-season mat
  • Anti-slip GripSkin coating
  • Ingenious contour shape, 2 mats fit next to each other in confined space
  • Schnozzel Pumpbag included
  • 2 year warranty
  • Mat weighs: 586g
  • Pump weighs: 60g
  • Thickness: 9cm
  • Length: 197 cm
  • Shoulder width: 65 cm
  • Foot width: 42cm
  • Packed size: 25 x 12cm
  • Temperature rating: -20 °C
  • ASTM R-Value: 5.2
  • Old R-Value test (EMPA): 0.88 (SI), 5.0 (US)

ASTM R-Value:

From 2020, there is a new industry standard for measuring the R-value (level of insulation) of sleeping mats – ASTM F3340-18. This new standard is the sleeping mat equivalent to the EN rating for sleeping bags.

You can now directly compare the R-value of mats rated using the ASTM F3340-18 with confidence that is a fair and accurate comparison between mats. In simple terms, the higher the R-value, the warmer the mat.

In general terms, an R-value below 2.0 is for summer use, 2.0 to 4.0 is for cooler 3 season use and 4.0+ is for winter temperatures. This will be also be dependent on your sleeping bag, how cold you sleep etc. Please contact our customer service team if you need advice on choosing the right mat for your activity.


  • Top: 20 D Polyester, TPU polyether film laminate, hydrolysis resistant, Honeycomb Gripskin coated, Oeko-Tex 100 certified
  • Bottom: 20 D Polyester, TPU polyether film laminate, Hydrolysis resistant, Oeko-Tex 100 certified
  • Isolation: 200 g/m² Texpedloft microfibre, bluesign certified
Showing our 2 Exped SynMat HL Winter LW Long Extra Wide Sleeping Mat reviews with an average rating of Very Good. Would you like to write a review?
Review Summary - 4 out of 5 based on 2 ratings.
March 27, 2020 | Mark McLaren
Long and Wide??

Was a little disappointed with the Exped Synmat. It's R-value is justified and it's a great warm pad. But for a 6'2 guy with wide shoulders I struggled to stay on the pad. The length doesn't work for me when you add an inflatable pillow, just too short. I'd recommend for a smaller adult who maybe side-sleeps or moves during the night, but not for a larger person looking for the extra space.

Ultralight Outdoor Gear Limited
March 31, 2018 | malcolm stubbs
Best mat on the market

I've been using one of these for the last two years winter and summer. Recently I spent 9 nights at minus 6C and the mat kept me warm no problems at all. Because it is quite thick there is never any problem with branches or rocks digging in and even on rocky beaches you cannot feel anything.

Ultralight Outdoor Gear Limited