Stay safe, sleep warm

Temperature rating guide

How to use the Mont Temperature Rating System

The Mont Temperature Rating System is based on over 40 years of experience in the design, manufacture and use of sleeping bags in the wild. Any adventure, any weather, there is a Mont sleeping bag designed for, used in, and proven in that situation.

Cold sleeper rating and a warm sleeper rating.

If you are a cold sleeper you usually know it. They feel the cold and wear layers on an average temperature night.

The cold sleepers rating suggests that an average cold sleeper will be comfortable at or around that temperature.

If you are a warm sleeper you usually find yourself waking up hot in the middle of the night.

The warm sleeper rating suggests that an average warm sleeper will be comfortable at or around that temperature.

If you don't find you are a cold or warm sleeper always choose the colder sleeping temperature rating.

The Mont Temperature Rating System does not specify an Extreme Temperature. The Extreme rating found on some sleeping bags is a survival rating only and cannot be relied on for general use: you will be cold, you will be uncomfortable, you will probably not sleep, and there is a risk of injury. If there is a chance that you will see temperatures at or near the Extreme rating of your sleeping bag, that sleeping bag is not warm enough for that situation.

IMPORTANT CONSIDERATIONS

The stated range is an indication of the potential comfort range and minimum temperature that may be possible. This should be used only as a guide. Ratings can vary dramatically depending on whether you are a warm or cold sleeper.

Other factors that will determine your comfort in a sleeping bag are the type of sleeping mat used, whether you're wearing thermals, socks or headwear, your health, metabolism, age and fatigue, hydration levels and what you've eaten. Hydronaute XT shell will increase the warmth of a sleeping bag.

These temperature ratings assume you're using an appropriately insulated sleeping mat, you are well hydrated, well fed and dry.

We always suggest buying a sleeping bag with a temperature rating that will cover you a few degrees below the temperature you expect to face. It is much easier to cool down than it is to warm up.

* Weight refers to Standard size unless otherwise stated.

EXPEDITION 8000 XT SERIES

Model Sizes Weight * Season/Use Women &/or Cold Sleepers Men &/or Warm Sleepers
59.3oz

Designed purely for attempts on the World's great peaks.

Made with a larger 'expedition fit' to allow the wearing of down clothing as required, available in Small/Medium (S/M) & Medium/Large (M/L) sizes.

SPINDRIFT XT SERIES

Model Sizes Weight * Season/Use Women &/or Cold Sleepers Men &/or Warm Sleepers
44.6oz
57.5oz
50.4oz

Uncompromising sleeping bags designed for alpine & extreme cold conditions: Backcountry camping, polar expeditions & high altitude mountaineering.

Available in Standard, Women's & Extra-Large Sizes. Spindrift 700 available in Standard & XL only.

BRINDABELLA XT SERIES

Model Sizes Weight * Season/Use Women &/or Cold Sleepers Men &/or Warm Sleepers
46.9oz 21°F 10°F
52.4oz 4 season -12 0

Versatile sleeping bags for cool to cold adventures both above & below the snow-line.

Available in Standard, Women's & Extra-Large Sizes

HELIUM LIGHTWEIGHT SERIES

Model Sizes Weight * Season/Use Women &/or Cold Sleepers Men &/or Warm Sleepers
35.1oz
33.5oz
28.2oz
22.9oz

ZODIAC SERIES

Model Sizes Weight * Season/Use Women &/or Cold Sleepers Men &/or Warm Sleepers
45.9oz
37.4oz
33.2oz 43°F 34°F

Quality down sleeping bags designed for comfortable camping & bang for buck.

Available in Standard, Women's, Extra-Large & Extra-Extra-Large Sizes.

WARMLITE XT-R SERIES

Model Sizes Weight * Season/Use Women &/or Cold Sleepers Men &/or Warm Sleepers
44.8oz
43.7oz
37.4oz

Bunker down and stay warm in conditions well below what you would expect for sleeping bags of this price. Made with a 100% recycled Hydronaute XT-R Shell and a 100% recycled silk-touch Nylon lining.

Available in Standard, Women's & Extra-Large Sizes.

ZERO ULTRALIGHT SERIES

Model Sizes Weight * Season/Use Women &/or Cold Sleepers Men &/or Warm Sleepers
10.6oz
14.1oz

Incredibly lightweight & ultra compact down sleeping bags.

Appropriate for users up to 188cm tall.

EVO SYNTHETIC SERIES

Model Sizes Weight * Season/Use Women &/or Cold Sleepers Men &/or Warm Sleepers
27.7oz
57.1oz
46.6oz

The Evolution Series are a high performance synthetic alternative to down sleeping bags. By using Shingle Baffle Construction, Mont’s Evolution provide greater warmth, less weight & smaller packed size than quilted synthetic sleeping bags.

Available in Standard & Extra Large sizes.