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Exped SIM 3.8 Exped SIM 3.8 Farbe / color: black ()

Exped SIM 3.8

The quality selfinflating mat for those on a budget


The durable SIM 3.8 by Exped features the easy to use Exped flat valve. Therefore this mat has an inflation and separate deflation valve. Both valves have a one-way flap making inflation and deflation quick and easy. The mat’s fabric is a laminate of polyester and an absolutely airtight and moisture resistant PU film. The upper face has a honeycomb structure with slip resistant properties that still allows for easy movement with a sleeping bag. Seams are high frequency welded for durability. Not only the high quality of this mat convinces, also the low price - a perfect mat for first-time user!

Material / Details

  • Material: 100 % polyester, TPU Polyether foil laminated
  • Isolation: Polyurethan-Foam, 100 % polyurethane
  • Materials are certified by Oeko-Tex Standard 100
  • Selfinflating
  • Durable
  • Slip resistant
  • High frequency welded seams
  • FlatValve Technology, combined inflation and deflation valve with one way flap
  • Fabric grommets and multifunction stuffsack
  • Repairkit included
  • R-value (thermal resistance value): 4
  • Temperature: -11 °C (12°F)
Size M
- Dimensions: 183 x 50 x 3.8 cm
- Packed: 27 x 17.5 cm
- Weight: 860 g

Size LW
- Dimensions: 197 x 65 x 3.8 cm
- Packed: 35 x 18 cm
- Weight: 1185 g

The R-value (thermal resistance value) is a measurement of a given material's resistance to heat flow. The higher the R-value, the greater the insulating effectiveness and the slower the heat flow through it. With increasing R-value the weight also increases. A mat with an R-value of 10 weighs around 3kg. On a scale of 1-10 an R-value of 1 is suited for temperatures up to +7°C. Mats with a value of 10 are designed for temperatures down to -50°C.

Customer information:
The mattress has been storaged tightly rolled since production. We recommend to support the first self-inflate process with several breaths.

Store availability + Click & Collect

Buy online & free delivery to your preferred store

If this product is not available at the store of your choice, you can have it delivered there.
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  • Proceed to Checkout
  • Type of dispatch: “delivery to store”
  • Payment method „on pick-up“ or your preferred online payment method.
You will be notified by the store when your order is ready for pick-up.

This service is only available in Bremen, Oldenburg, Wilhelmshaven, Jever, Erfurt, Leipzig, Bonn, Hamm, Duisburg, Göttingen and Münster.
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Unterwegs is a company group of specialist outdoor shops which was formed in Wilhelmshaven, Germany in 1987. Initially founded as a pure retail business, the emphasis on service, quality, fairness and a diverse and inclusive range of products soon led to rapid growth and expansion.