Forclaz MT500 Folding Foam Sleeping Pad Review

Overview

The Forclaz MT500 Folding Foam Sleeping Pad is Decathlon’s accordion-style closed-cell foam (CCF) pad aimed squarely at 3-season backpackers who want bulletproof ground insulation without paying premium prices or worrying about punctures. It sports a certified R-2.2 rating and an aluminized coating on one face — putting it in direct competition with the Therm-a-Rest Z-Lite SOL and the NEMO Switchback, both of which cost significantly more. It won’t win any weight-weenie awards at 480g, but for budget-conscious hikers, beginners, or anyone wanting a reliable layering pad, it’s hard to argue with.

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Key Specs

Spec	Value
Weight	480 g (16.9 oz / ~1 lb 0.9 oz)
Unfolded Dimensions	195 × 55 × 2 cm (76.8 × 21.7 × 0.8 in)
Packed Volume	12.4 L
R-Value	2.2 (ASTM F3340-18 certified)
Temperature Rating	>41°F / >5°C
Foam Density	30 kg/m³ (1.9 lb/ft³)
Construction	Bi-material foam, aluminized film facing
Fold Style	Accordion
Warranty	10 years

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Performance

Insulation

The R-2.2 rating is certified to ASTM F3340-18 standard

— the same protocol now used by Therm-a-Rest and Sea to Summit, so the number is an honest apples-to-apples comparison.

R-values are additive, meaning you can combine two pads, and Decathlon places R-2.2 firmly in the “2–3 season” category, appropriate for spring through fall use.

That puts it right at — or slightly above — the Z-Lite SOL’s tested performance, which the r/Ultralight community has noted repeatedly.

What you can’t capture in a spec sheet is how CCF foam feels in the field. Veteran CCF users on Reddit point to the MT500 as “the best budget, packable and easily available option”, and several note anecdotally that foam always feels warmer than the R-value implies. Don’t expect this to carry you through below-freezing nights on its own — Decathlon’s own guidance puts an R-value of 3–4 as the threshold for 4-season use — but for warm-weather and mild fall shoulder-season trips, the insulation holds up well.

One smart trick worth knowing: R-values stack, so pairing this with an existing inflatable pad gives you a combined R of at least 4.2 — solid performance down to freezing and slightly below. Several users do exactly this, running the foam pad primarily as a puncture-resistant under-layer in winter.

Comfort

At 55cm wide and 195cm long, the MT500 is generously sized. More than one reviewer highlights that it’s wider than most competition — the only foam pad over 51cm they could find — which matters for side sleepers and anyone with broader shoulders. The aluminized side should face up toward your sleeping bag, with the foam side down on the ground. The molded relief design allows for 2cm of thickness, which gives more postural support than a flat slab of foam.

That said, this is still a foam pad. It takes a night or two to adjust, and side sleepers on rocky terrain will know it. Users describe it as “decently comfortable for a thin material” that you get used to within the first night. That’s about right — if you’re coming from an inflatable, budget a couple of nights to recalibrate your expectations.

Durability

The aluminized film is designed specifically to limit abrasion

, which is the main failure mode on CCF pads. Over time, the surface will develop micro-tears —

similar to what you’d see on a Therm-a-Rest Thinlight after extended use

— but this doesn’t meaningfully affect insulation. Foam is inherently indestructible compared to inflatables; it’s impossible to puncture, and it can take a beating from rocks, dirt, and wet ground without complaint.

One user specifically chose it for a survival course requiring open-air sleeping without a sleeping bag, and appreciated that unlike an inflatable pad another participant was using, there was zero risk of bursting.

Backed by a 10-year guarantee from Decathlon, the long-term value proposition is hard to beat.

Packed Size

This is where the MT500 earns its one real mark against it. At 12.4 liters folded, it won’t fit inside most backpacks. Several reviewers note that while it’s genuinely lightweight and comfortable, the bulk makes fitting it inside a pack impossible — it’s best strapped to the outside. If you’re running a frameless or minimalist pack, that exterior strapping can be awkward. The accordion fold doesn’t compress nearly as tightly as a rolled pad like the RidgeRest. For context, the Z-Lite SOL comes in around a similar volume, so this isn’t an MT500-specific problem — it’s just the inherent trade-off of accordion-style CCF pads.

Versatility

Decathlon designed this to double as a seat, mat, cushion, or half-mattress

, and that flexibility is genuinely useful on trail. Because the pad folds accordion-style, you can fold it down to a sit pad in seconds.

You can also fold it in half to effectively double the R-value to 4.4 and still cover most of your body

— a clever hack for cold-snap emergencies.

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Pros & Cons

Pros

• R-2.2 is certified to ASTM F3340-18 — competitive with pads that cost 2–3× more
• Generous 55cm width beats most competitors in this category
• Zero puncture risk; indestructible in normal backpacking use
• Aluminized coating adds durability and reflects radiant heat back toward the sleeper
• Can be stacked with an inflatable pad for combined R-4.2+ in colder conditions
• Accordion fold functions well as a sit pad, groundsheet, or emergency layer
• 10-year manufacturer warranty
• Genuinely budget-friendly pricing

Cons

• 12.4L packed volume is bulky — plan on lashing it to the outside of your pack
• 480g is heavier than comparable options (the uncoated MT500 in the smaller 180cm size weighs 370g)
• Not enough insulation for solo sub-freezing use
• Surface micro-tears develop over heavy use, though they don’t compromise warmth
• No carry bag included

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Who Should Buy This

The MT500 foam pad is the right call for budget-conscious 3-season backpackers, thru-hikers doing their first long trail, and anyone who wants a carefree, maintenance-free pad that simply cannot fail on them mid-trip. It’s also an excellent supplemental pad for winter campers who want to boost the R-value of an existing inflatable without spending much money. If you already own a lightweight inflatable and want cheap insurance against both punctures and cold ground, this is a near-perfect layering solution. It’s not for the gram-counter chasing sub-200g base weights, nor for anyone heading into sub-freezing alpine terrain without a second pad.

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Verdict

On Reddit’s r/Ultralight, the MT500 consistently earns the title of best budget CCF option — warmer than comparable options from the Thermarest Z-Lite and NEMO Switchback, at a fraction of the price.

The certified R-2.2 rating, wide 55cm platform, aluminized face, and indestructible foam construction make this a genuinely compelling pad for the money. The 12.4L packed volume is a real limitation you’ll feel every time you strap it to your pack, and the 480g weight is about 2 oz heavier than a Z-Lite SOL — but for most 3-season hikers on a budget, those trade-offs are easy to accept.

Rating: 9.5 / 10 — the best-value CCF pad currently available, as long as bulk doesn’t break your system.