On a hike, everything you sleep on goes on your back, so the pad has to be light and small. It also has to be comfortable enough that you actually sleep. I took the NEMO Tensor Ultralight on a few overnight hikes to see how well it manages both.
It’s an insulated air pad: 369 g in the Regular Mummy I tested, 8.9 cm thick and an R-value of 2.8, with a pump sack so you don’t have to blow it up. It packs to about the size of a water bottle.
What’s in the box
The pad comes rolled in a stuff sack, with a Vortex pump sack to inflate it. Inside the pad are NEMO’s Spaceframe baffles, which keep it stable, and a layer of Thermal Mirror film for insulation. The shell is bluesign approved nylon: a softer 20D on top and a tougher 40D underneath.
NEMO backs the Tensor with a lifetime warranty. It’s now sold as the Tensor Trail, in four sizes; more on those further down.
What we like
- Ultralight at 369 g
- 8.9 cm thick
- Stable, no wobble
- Quiet, no crinkle
- Packs to water-bottle size
- Vortex pump sack included
What we don’t
- Thin 20D top fabric
- Mummy shape feels narrow
- 2.8 R-value limits cold use
Quick Specs
| Spec | Details |
|---|---|
| Brand | NEMO |
| Material | 20D & 40D bluesign® Nylon |
| Colour | Mango and huckleberry |
| Weight | 369 g |
| Loft | 8.9 cm |
| R-value | 2.8 |
| Warranty | Lifetime |
| Included | Vortex pump sackStuff sack |
First look
Packed, it’s barely bigger than a water bottle, and my first thought was that something this small couldn’t be comfortable. The fabric is smooth and soft, and there was no crinkling when I unrolled it, which was a relief.
Inflating is easy. I attached the Vortex pump sack, gave it a few scoops of air and the pad was up in under a minute. Once it’s full you notice the baffles straight away: it feels solid and supportive, without the wobbly, waterbed feel of many air pads.
Materials & Build QualityMaterials & Build Quality
Using two fabrics is a sensible way to save weight. The lighter 20D nylon on top feels softer against you, and the tougher 40D nylon underneath protects better against sticks and stones. The downside is that the top fabric is thin, so it pays to clear the ground under the tent.
The Thermal Mirror film inside floats rather than being bonded in, and that’s what gets rid of the crinkly noise that can keep you and your tent mate awake. The build feels very good, and the lifetime warranty adds peace of mind at this price.
Ergonomics & WeightErgonomics & Weight
At 369 g I barely notice the Tensor in my pack, and with the small packed size I don’t have to leave other gear behind to carry a comfortable pad. The mummy shape saves material and weight but can feel a little narrow if you sleep on your side or move around a lot. The 8.9 cm of loft keeps hips and shoulders well off the ground.
The Laylow valve lies flat against the pad, so it doesn’t dig into you at night, and you can let out a little air at a time to get the firmness right. Deflating is quick too, which makes packing up in the morning easy.
Performance & FeaturesPerformance & Features
What impresses me most is how quiet it is. On a still night in the bush there’s no crinkling at all. The pad stays stable and spreads my weight evenly, without bouncing like a pool float.
The R-value of 2.8 makes it a three-season pad. I wouldn’t take it into the snow, but on cool nights down to about 0°C it keeps me warm. The Vortex pump sack is more than a convenience: it saves your breath and keeps the moisture from your lungs out of the pad, which can damage the insulation over time.
Sizes and shapes
The Tensor Trail comes in four sizes. The two Regulars are the same length and width, and the Regular Mummy we tested is the lightest because it tapers to 41 cm at the feet; the others are rectangular. The wide versions add 13 cm of width, which side sleepers will appreciate, at a cost of about 100 g.
| This reviewRegular Mummy (ours) | RectangularRegular | 13 cm widerRegular Wide | Longer, widerLong Wide | |
|---|---|---|---|---|
| Shape | Mummy | Rectangular | Rectangular | Rectangular |
| Width | 51 cm | 51 cm | 64 cm | 64 cm |
| Width at feet | 41 cm | 51 cm | 64 cm | 64 cm |
| Length | 183 cm | 183 cm | 183 cm | 193 cm |
| Thickness | 8.9 cm | 8.9 cm | 8.9 cm | 8.9 cm |
| Weight | 369 g | 395 g | 491 g | 520 g |
| Shop | Check price at Amazon | Check price at Amazon | Check price at Amazon | Check price at Amazon |
All four are 8.9 cm thick. If you’re taller than about 183 cm, the Long Wide is the only one that fits.
Vs other hiking mats
The NEMO Tensor is one of four mats we’ve tested that are light enough to carry in. Next to it, the Trekology UL80 is a cheaper, thicker air pad with a lower R-value, the Mountain Designs Airlite 5.5 is a thinner insulated air mat with a higher R-value for about a quarter of the price, and the Sea to Summit Camp Mat SI is a thin self-inflating mat that’s warmer but heavier. The Tensor is the lightest of the four.
This one NEMO Tensor |  Airlite 5.5 |  Camp Mat SI |  Trekology UL80 | |
|---|---|---|---|---|
| Type | Air pad | Air pad | Self-inflating | Air pad |
| Thickness | 8.9 cm | 5.5 cm | 3.8 cm | 10 cm |
| R-value | 2.8 | 3.3 | 4.2 | 1.6 |
| Weight | 369 g | 600 g | 780 g | 568 g |
| Price | $370 | $100 | $140 | $74 |
| Our score | 9.2 | 8.8 | 9.4 | 8.7 |
Conclusion: NEMO Tensor Ultralight Sleeping PadConclusion
The NEMO Tensor Ultralight does what it promises. It weighs 369 g, packs small, stays quiet and doesn’t wobble, and the pump sack makes it easy to inflate. It’s expensive, the 20D top fabric is thin and the R-value of 2.8 keeps it to three seasons. If you carry your bed on your back, the sleep is worth the money.
A light, quiet pad that's worth the money if you carry your bed.
It weighs 369 g, packs to water-bottle size and gives 8.9 cm of stable, quiet comfort, and the pump sack makes it easy to inflate. It's expensive, the 20D top fabric is thin and the R-value of 2.8 keeps it to three seasons.
- Backpackers
- Hikers
- Ultralight
Yes, if you carry your bed. It’s a premium price, but 8.9 cm of quiet comfort at 369 g is hard to match. The R-value of 2.8 limits it in the cold.
