DownTo1 Packs

The engine's answer

Best sleeping mat in winter nights near −12 °C, under €700

Therm-a-Rest

NeoAir XTherm NXT

Winter-grade warmth that still packs like a summer mat.

  • R-value that copes with snow and frozen ground
  • Only a little heavier than the XLite
  • Genuinely four-season without a foam mat underneath
  • Expensive
  • Overkill, and slightly sweaty, in summer

Find it at Bergfreunde · Trekkinn · Decathlon · Alpinetrek · eBay (used)

Why it wins, in numbers

Therm-a-Rest NeoAir XTherm NXT is the sleeping mat the engine picked for this trip: €270 and 439 g, R-value 7.3, a 50% match on the questions asked. The kit around it comes to €675 of the €700 ceiling, leaving €25.

What the engine asked for: a sleeping bag rated to −14 °C or lower, a mat with an R-value of at least 5.5, a pack of at least 40 L, and €700 for all four; anything that falls short of these is flagged beside the item.

The kit it belongs to

Four items chosen together, not four separate winners. Swapping one moves the others.

3.44 kg on your back · €675 of a budget of €700

Tent
3F UL Gear Lanshan 2: €130, 1.10 kg, Season rating 3, 50% match.
Sleeping bag
Forclaz MT100 15 °C: €35, 800 g, Comfort rating 15 °C, 28% match. Flagged: Not warm enough for these nights.
Sleeping mat
Therm-a-Rest NeoAir XTherm NXT: €270, 439 g, R-value 7.3, 50% match.
Backpack
Osprey Exos 48: €240, 1.10 kg, Capacity 48 L, 50% match.

What the runners-up gave up

Each of these still leaves a kit that closes — the budget holds and the pack shuts. This is where each one lost.

  • Exped Ultra 7RSnow-camping warmth without a foam mat underneath.Exped Ultra 7R — €260, 730 g — gives up Weight: 730 g against the winner's 439 g. It scores 50% to the winner's 50%.
  • Sea to Summit Ether Light XT ExtremeTen centimetres of air with a winter R-value underneath it.Sea to Summit Ether Light XT Extreme — €260, 700 g — gives up Weight: 700 g against the winner's 439 g. It scores 50% to the winner's 50%.
  • Nemo Tensor Extreme ConditionsThe warmest mat here, for ground that is genuinely frozen.Nemo Tensor Extreme Conditions — €280, 640 g — gives up Weight: 640 g against the winner's 439 g. It scores 50% to the winner's 50%.

Questions this trip raises

How much does the whole kit cost?
€675 for all four items, €25 under the €700 ceiling. Prices are indicative euro list prices; the shops set their own.
How much does it weigh?
3.44 kg base weight — tent, sleeping bag, mat and pack together, before food, water and clothes. The pack is rated to carry 16 kg comfortably.
Is Therm-a-Rest NeoAir XTherm NXT warm enough on the ground at −12 °C?
Its R-value is 7.3. For nights near −12 °C the engine requires at least 5.5, which it meets.

Change an assumption

This page answers one trip. Yours is not that trip — adjust the nights, the budget or the company and watch all four re-rank.

Build my kit

Specifications are manufacturers’ own published figures and prices are indicative, not live. Comfort ratings and R-values are comparable across brands but describe a standardised sleeper on standardised ground — neither is a promise about you on a particular night. Check the current spec and price with the retailer before buying.