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Forclaz M100, Foam Hiking Mattress

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Sale price: $9.99 Regular price:

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Model: 5591048

Product Features

Forclaz M100, Foam Hiking Mattress is designed for protecting yourself from the ground and sleeping when backpacking or bivouacking.

7.4 oz the lightest foam mattress and groundsheet. 70.9" x 19.7" x 0.3" for minimal comfort. 10-year warranty.

A photo of the Forclaz M100, Foam Hiking Mattress in use

Abrasion resistant

Alu film on upper surface reducing abrasion and increases thermal insulation.

Easy to transport

Weighs 7.4 oz. Volume when rolled: 6.6 L. Elastic strap.

Sleeping comfort

Dimensions 70.9" x 19.7" x 0.3". Simple and cursory postural comfort.


Ideal for warm environments (>59°F). R-Value 1.2

Easy assembly/dismantling

Rolled foam. Elastic strap.


Product Customer Reviews

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838 Reviews
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Forclaz M100, Foam Hiking Mattress,pewter
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I enjoyed

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So light to carry around and of course good price point. Prefer slightly wider though.

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Hi Sann,

Thank you for taking the time to review our products. We are pleased to hear you enjoy using this Trekking Foam Mattress Arpenaz M100! Your feedback is greatly appreciated, our design team will look into it to improve our future designs!

We look forward to more of your reviews and sharing! Plus, the new Decathlon app has been launched and you can now purchase all your favourite sports goods with just a few clicks on your smartphone! Yes, it's now available both in the App store and Google Play Store! Download now and happy shopping!

Thank you for your support and stay safe! :)

Sport on safely!


CSM Digital Leader

Nice product

Nice product

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missing in the delivery

missing from my delivery

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Perfect for using as mattress inside tent

Had a comfortable sleep inside my tent using this as sleeping mattress

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good but bad in humid/wet condition

mattress soakes water in wet conditions and becomes unusable

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Great value

Good value product

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Gets the job done

For what it's worth, it gets the job done. Only bought it, as I didn't want to spend too much on a self-inflatable mat. It kept me reasonably warm and insulated from the ground. However, I will be looking at self-inflatable mats for my next trip.



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 Thank you very much for your review! 


Good value, lightweight, good comfort

Great trekking mattress for Duke of Edinburgh silver. Lightweight and compact enough to carry on the backpack but big enough to provide insulation and comfort.

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Camping mat

Used outdoors on grass. Comfortable. No princess and the pea type complaints.

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Good and comfortable but width should more at least 6 inch more for better .

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As a low cost mat, this serves it purpose

This is a great alternative to sleeping pads . It is lightweight and acts as a mildly insulating layer from the ground (i'm not sure it has an R-value). I would recommend this for use during the summer and milder winter months.

Good value

Lightweight and good value for money. Like the piece of elastic that comes with it to keep it rolled up. A good touch. Bought the thinner mat as lighter but still reasonably comfortable. Perfect for my son's DofE.

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Sleep tight

This is good for its lightweight carry on

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Additional Product Information



  • 100% Polyethylene low density

Volume and dimensions when folded

Rolled dimensions Ø 5.1" x 19.7". Volume 6.6 L. Density of the foam 66.1 lbs/m3.

Thermal properties and warmth

Sleep on aluminized side, facing the sleeping bag with foam side on the ground to minimize losses of body heat. R-Value 1.2 (measured by EMPA, an independent laboratory). The R-Value is a measure of thermal performance and insulation. The higher the R-Value, the more the mattress insulates you from the cold ground. An R-Value of 5.9 is equivalent to a minimum temperature rating of approximately -11°F. 0.7 is equivalent to a temperature rating of +52°F. R-Value is not a standard (in progress).

Product test

The sleeping comfort, also known as "postural comfort," of the mattresses is defined by our Research and Development Center. All our mattresses are subjected to mechanical tests to check the performance and resistance of the mattress in order to guarantee you the best sleep and the best recovery. We also carry out numerous field tests in real-life conditions.

A score for comparing products' environmental impact

The environmental impact of the products is calculated based on the lifecycle of the product with different indicators. An ABCDE score is provided to help you easily identify the most environmentally friendly products. Use the rating to compare the same type of product (T-shirts, pants, backpacks). Decathlon is a supporter of this environmentally-friendly labeling approach. Explanatory video:



Product testing

This mattress is guaranteed for a period of 10 years from the date of sale indicated on the receipt. The product covered by the warranty will be repaired or exchanged free of charge. The warranty covers the defects of your mattress apart from those resulting from normal wear and tear and improper use. This special 10-year warranty is only valid with the product and sales receipt.

Care instructions

Do not machine wash the mattress. Wipe with a damp sponge when needed. To dry, stretch out in a dry and well-ventilated place without exposing to the sun or close to a heat source.

Superior quality. Unbeatable prices.

For 40 years, Decathlon has delivered the best value in the retail sports industry by offering high-quality, sustainable and cost-effective products.

Decathlon makes the difference
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    Research and development

    delivers high-quality cost-effective products

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    minimize manufacturing costs

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    Minimal retail footprint

    lowers overhead and indirect costs


Size Guide Visual