DownTo1 Packs

The engine's answer

Best side sleepers sleeping mat in chilly nights around 3 °C, under €400

Naturehike

R5 Insulated

A high R-value on paper for a remarkably low price.

  • High stated R-value for under a hundred euros
  • Long and reasonably thick
  • Pump sack included
  • Stated R-values from this maker are not independently tested
  • Durability is the usual compromise

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

Why it wins, in numbers

Naturehike R5 Insulated is the sleeping mat the engine picked for this trip: €80 and 750 g, R-value 5.0, a 69% match on the questions asked. The kit around it comes to €400 of the €400 ceiling, leaving €0.

What the engine asked for: a sleeping bag rated to 1 °C or lower, a mat with an R-value of at least 2.5, a pack of at least 35 L, and €400 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.

4.45 kg on your back · €400 of a budget of €400

Tent
3F UL Gear Lanshan 2: €130, 1.10 kg, Season rating 3, 50% match.
Sleeping bag
Forclaz MT500 0 °C Down: €130, 1.10 kg, Comfort rating 0 °C, 50% match.
Sleeping mat
Naturehike R5 Insulated: €80, 750 g, R-value 5.0, 69% match. Strongest on: Sleep style.
Backpack
Forclaz MT100 Easyfit 50: €60, 1.50 kg, Capacity 50 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.

  • Naturehike Ultralight AirThe budget end of the air-mat market, with the expected caveats.Naturehike Ultralight Air — €50, 480 g — gives up R-value: 2.5 against the winner's 5.0. It scores 55% to the winner's 69%.
  • Forclaz MT500 Air LA cheap, long, perfectly adequate summer mat.Forclaz MT500 Air L — €70, 550 g — gives up R-value: 2.5 against the winner's 5.0. It scores 48% to the winner's 69%.
  • Multimat Adventure 25A cheap British self-inflating mat that turns up on a lot of first trips.Multimat Adventure 25 — €60, 850 g — gives up Thickness: 2.5 cm against the winner's 7.0 cm. It scores 33% to the winner's 69%.

Questions this trip raises

How much does the whole kit cost?
€400 for all four items, €0 under the €400 ceiling. Prices are indicative euro list prices; the shops set their own.
How much does it weigh?
4.45 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 Naturehike R5 Insulated warm enough on the ground at 3 °C?
Its R-value is 5.0. For nights near 3 °C the engine requires at least 2.5, 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.