Therm-a-Rest NeoAir XLite NXT

Comfort is where the Therm-a-Rest NeoAir XLite NXT falls short, and it is a real weakness rather than a minor nitpick. The pad is 7.6 cm (3 in) thick and bottoming out is generally not an issue. However, the pad does not feature a stretchy top material, which could add to the comfort. The Therm-a-Rest NeoAir XLite NXT uses horizontal baffles, and in my experience that is one of the least comfortable baffle systems available. It does not provide much edge support, and because I sleep on my side about 80% of the time, my arm consistently goes numb and forces me to shift. I have used pads with a dimpled baffle system, where raised and lowered sections act almost like small springs, and I can sleep through an entire night on those without waking up. On the Therm-a-Rest NeoAir XLite NXT, I pretty much never make it through a full night without waking up to toss and turn. Back sleepers will likely have a much easier time with this pad than side sleepers will. If comfort matters more than any other category, this probably is not the right pad.

Warmth is one of the Therm-a-Rest NeoAir XLite NXT's greatest strengths. It has an ASTM R-value of 4.5, a slight increase over the previous version, and it is remarkably warm for three-season use. I have tested it on cold ground and it performs right up to what that R-value promises. Two technologies get it there. ThermaCapture is a reflective film suspended inside the pad that cuts radiative heat loss, and the Triangular Core Matrix is a baffle structure that limits air movement inside the pad and reduces convective heat loss. Convective heat loss is usually the main reason pads underperform their rated warmth in real-world conditions, and the Therm-a-Rest NeoAir XLite NXT's construction handles that well. It is not a pad for winter unless the climate is mild, but for spring through fall, it keeps me plenty warm and is impressively warm for its weight.

Weight and packability is the Therm-a-Rest NeoAir XTherm NXT's standout category. The Regular Wide rectangular version tested here comes in at 542 g (1.2 lb) on my scale, close enough to the advertised 540 g (1.2 lb) to fall within margin of error, a good sign of Therm-a-Rest's accuracy on their spec sheet. Including the stuff sack and inflation bag, the tested pad weighs 615 g (1.4 lb). The lighter mummy-shaped Regular size, 51 cm (20.1 in) wide, weighs just 370 g (13.1 oz).

The Therm-a-Rest NeoAir XLite NXT comes in a wide range of sizes. There are rectangular versions called Max and mummy-shaped versions, offered in three lengths, Short, Regular, and Large, and two widths, 51 cm (20.1 in) and 64 cm (25.2 in). I generally recommend the wider sizing since it is noticeably more comfortable and gives more room to toss and turn. At 178 cm (5 ft 10 in) tall, the Regular length works perfectly for me. Between the mummy and rectangular shapes, it comes down to personal preference. I usually go with the mummy version since it saves weight and I do not need the extra space at the head and foot ends.

Packed size is excellent too. The tested Regular Wide packs down to about the size of a Nalgene bottle, and the mummy-shaped Regular size packs down to just over the size of a can of Coke.

Against the closest comparable pads by weight, warmth, and price, the NEMO Tensor All-Season and the Big Agnes Zoom UL, the Big Agnes Zoom UL is lighter, and the NEMO Tensor All-Season lands at essentially the same weight with a higher R-value on paper. Even so, the Therm-a-Rest NeoAir XLite NXT sleeps warmer than either pad in real-world testing. That combination keeps this among the best warmth-to-weight ratios of any sleeping pad on the market right now.

Valves tend to be the biggest factor in terms of ease of use. The new WingLock valve was not something I was initially excited about, and at first I thought it was only a minor improvement over the old valve, which was by far the worst part of the previous version. But it has grown on me. It inflates and deflates at a solid rate and holds up well in cold temperatures. Pads I take into subfreezing conditions can end up with valves that gum up or ice over, and the WingLock has not given me that problem. It is easy to adjust the pad's inflation while lying on it in the night, and it deflates easily when packing up camp. That said, it is still not as good as Sea to Summit's valve design. If it does ever fail, it is field-replaceable. Pull the valve out, push in a replacement, and there is no need to retire the whole pad.

The included pump sack is a weak point. It tends to pop off the valve mid-use, and enough air escapes through the seams that it does not push much volume into the pad. I have switched to using the Flextail Tiny Pump instead, which attaches cleanly, inflates the pad quickly, and even has a small light built in.

Durability is the least of my concerns with the Therm-a-Rest NeoAir XLite NXT as I have never had one fail on me across years of use. It uses 30-denier ripstop nylon, and Therm-a-Rest's manufacturing on this line is clearly dialed in. There are occasional manufacturing defects, and a small number of people have reported baffle blowouts, but that is rare. I keep an eye on reviews and forums to track how gear actually holds up over time, and the Therm-a-Rest NeoAir XLite NXT is one of the sleeping pads with the fewest reported problems out there.

Noise has improved massively from the previous version. Therm-a-Rest claims the NeoAir XLite NXT is 80% quieter than the previous version, and I can back that up. The old NeoAir XLite sounded like sleeping on a bag of chips, loud enough to annoy a tent-mate or even someone camped nearby. This version crinkles only faintly, barely a rustle. Anyone who passed on the old NeoAir XLite because of noise should take a look at the new Therm-a-Rest NeoAir XLite NXT.

The Therm-a-Rest NeoAir XLite NXT earns its reputation. If the best possible warmth for the least possible weight is the priority, this is close to the top of the market, and the durability and noise improvements make it an easy pad to trust over years of use. Price is a real factor too, and for some people that alone will be worth weighing against everything else it does well. But go in clear-eyed about comfort. For side sleepers, or for anyone who values comfort more than shaving weight, that is the one category where this pad asks for a compromise. Knowing which of those two things matters more makes the choice easy.