Exped MegaMat vs MegaMat Max: two more inches of foam, 2.5 R-value and 1.7 pounds

The verdict

These are the same mat at two thicknesses. Exped publishes the same fabrics on both — a recycled 50D tricot polyester top and a recycled 75D polyester bottom, both TPU-laminated — the same 16 kg/m³ open-cell polyurethane foam core, the same Sidewinder bag, repair kit and Top-Up Pump in the box, the same five-year warranty, and the same repair path through Exped's own workshops. Three numbers differ: thickness, R-value and weight.

Side-by-side specs

What is identical

The fabric is the same on both faces: Exped lists a recycled 50D tricot polyester top with a TPU laminate and a recycled 75D polyester bottom with a TPU laminate. The tricot top is the reason either mat feels like bedding rather than a dry bag, and it is identical. The foam is the same 16 kg/m³ open-cell PU on both, so the two mats feel the same under your hand; the Max simply has more of it.

The support package is also the same: a five-year warranty on defects in materials and workmanship, a repair kit in the box, a separately sold Field Repair Kit with UV glue and TPU patches, no replacement valve listed, and Exped repairing mats in its own workshops — including non-warranty damage for a nominal charge, which is unusually good and the reason both mats score the same 5 of 10 on repairability in our rubric.

And the width and length are the same at LXW: Exped publishes 197 x 77 cm (77.6 x 30.3 in) for both. If your reason for looking at the Max is a bigger bed, it is not the answer — it is the same footprint, taller.

Thickness: 3.9 inches versus 5.9 inches

The MegaMat is 10 cm of foam. The Max is 15 cm. Exped publishes both in centimeters, which matters because retail listings round them to 4 and 6 inches; the real figures are 3.9 and 5.9 inches and the Max is 50% thicker, not 50% more comfortable.

What the extra two inches buys is sink depth — how far a hip or a shoulder can press in before it reaches the firm resistance of a fully compressed mat or, worse, the ground. For a back sleeper of average build, 3.9 inches is already past the point where that happens; the mat has more travel than the sleeper uses. For a side sleeper, for a heavier sleeper, or for anyone whose lower back complains when the hips cannot drop, the extra 2 inches is the whole product. Those cases are ranked in best camping mattresses for side sleepers and best camping mattresses for back pain.

R-value 8.1 versus 10.6

Exped publishes both figures as ASTM R-values, measured to the standardized method, which means they are directly comparable with every other mat that quotes one. R 8.1 is already a genuine winter number — it is the second-highest in our whole registry, behind only the Max. R 10.6 is the highest we have recorded anywhere.

The honest framing: above roughly R 6 you are buying insurance rather than warmth you will feel on a normal trip. Going from 8.1 to 10.6 matters if you camp on snow, on frozen ground, or in a rooftop tent in winter where the cold comes from underneath with nothing to block it. It does not matter in a summer campground, where either mat is overkill and a thinner pad would do. What R-value actually measures, and which band suits which season, is in camping mattress R-value explained.

Sizes, and the one that only comes one way

This is the practical difference most comparisons miss. Exped lists the standard MegaMat in three sizes: MW at 183 x 65 cm (72.0 x 25.6 in) and 4.6 lb, LW at 197 x 65 cm (77.6 x 25.6 in) and 5.0 lb, and LXW at 197 x 77 cm (77.6 x 30.3 in) and 5.7 lb. The MegaMat Max is listed in LXW only.

So if you need a narrower mat — two sleepers side by side in a three-person tent, or a mat that fits a cot deck or a vehicle platform — the standard MegaMat is the only one of the two that can do it. At 30.3 inches wide, two Maxes side by side need over 60 inches of floor. Exped's own answer for couples is a different product, the MegaMat Duo in queen, which we rank in best camping mattresses for couples.

Weight and packed size

LXW against LXW: 2,600 g (5.7 lb) packing to 79 x 25 cm (31.1 x 9.8 in) for the MegaMat, against 3,355 g (7.4 lb) packing to 75 x 35 cm (29.5 x 13.8 in) for the Max. The Max is 1.7 lb heavier and — the figure that actually bites — four inches fatter rolled, even though it is slightly shorter in the bag.

Neither is a backpacking mat and Exped does not pretend otherwise; these are car-camping and vehicle mats. But a 13.8-inch-diameter roll is a real object in a packed trunk, next to a cooler and four camp chairs. If space in the car is the binding constraint rather than comfort, that is a reason to take the standard mat. Our car-camping pad rankings cover the thinner options.

Warranty and repair: five years, and a workshop

Identical, and better than the warranty term alone suggests. Exped's five years is shorter than the lifetime terms from Therm-a-Rest, Sea to Summit and NEMO, and it costs both mats points in our rubric. What partly offsets that is the repair route: a repair kit comes in the box, Exped sells a Field Repair Kit with UV-cure glue and TPU patches, and Exped repairs mats in its own workshops — non-warranty damage included, for a nominal charge. For a foam mat, where the common failure is a puncture rather than a structural one, that is the thing you actually use.

The gap in both is the valve. Exped lists no replacement valve for either mat, and a failed valve on a self-inflating mat is a harder DIY job than a puncture. The patching methods for everything else are in how to fix a camping mattress leak.

Who should buy which

Our scores land at 7.8 for the Max and 7.7 for the MegaMat, which is as close as this rubric gets: the Max takes a full 10 on fit and comfort for its thickness and R-value, and gives back two points on portability for the weight and the roll diameter. Everything else is a tie. That near-tie is the right answer — between these two the decision is not quality, it is your body and your vehicle.

The two mats, in full

Buy the standard MegaMat if / buy the Max if

Buy the standard MegaMat if

• You sleep on your back or front, where 3.9 inches of foam already has more travel than you use.
• You need a size other than LXW — the MW and LW at 25.6 inches wide are MegaMat-only.
• Trunk space is the constraint. A 9.8-inch roll against a 13.8-inch one is a real difference.
• You camp above freezing. R 8.1 is already the second-highest figure in our registry.
• You want two mats side by side in a tent that is not enormous.

Buy the MegaMat Max if

• You are a side sleeper. This is the single clearest case, and the thickness is the reason.
• Your lower back objects when your hips cannot drop — 5.9 inches lets them.
• You camp on snow, frozen ground or a rooftop platform, where R 10.6 earns its keep.
• You are a heavier sleeper and have bottomed out thinner mats before.
• You only ever sleep one to a mat and the LXW footprint suits you.

Buy neither if

• You want a lifetime warranty. Therm-a-Rest's MondoKing 3D and Sea to Summit's Comfort Deluxe both carry one — see best camping mattresses and MegaMat vs MondoKing.
• You are backpacking. Both are car-camping mats; 5.7 lb is the floor here.
• You want a built-in pump. Neither has one; both come with a Top-Up Pump you use after they self-inflate, and the pump-equipped air beds are in best camping mattresses with a built-in pump.