Ashwin Lewis
Sleeping bags are labelled with a degree rating that indicates the temperature range in which the bag is designed to keep the user warm and comfortable. This is known as the sleeping bag's temperature rating, and it is the most important factor when choosing a sleeping bag. The temperature rating is an estimate based on lab testing, which simulates how a sleeping bag is used. However, real-world comfort may differ from the lab-tested temperature rating due to various factors such as clothing, gear, body type, weather conditions, and more. The degree rating on a sleeping bag can also be indicated by the season it is designed for, such as a three-season bag suitable for temperatures between 10°F and 35°F (-12°C to 2°C). It's important to consider your own internal thermostat when choosing a sleeping bag, as well as the lowest temperature you're likely to encounter.
| Characteristics | Values |
|---|---|
| Purpose | Sleeping bags are designed for camping, backpacking, mountaineering, or packrafting. |
| Temperature Ratings | Sleeping bags have temperature ratings that indicate the lowest temperature they are intended to keep the user warm and comfortable. These ratings are estimates and are based on lab testing that may not account for all real-world variables. |
| Comfort Temperature | The comfort temperature is the lowest temperature a bag is designed to keep the user comfortable without additional blankets, assuming the user is wearing long clothes and using a sleeping pad. It is typically used as a baseline for people who feel cold easily. |
| Lower Limit Ratings | Lower limit ratings indicate the temperature at which the average sleeper would remain warm, and are used as a reference for people who sleep warm. |
| Season-Based Ratings | Sleeping bags are also rated based on the seasons they are suitable for. One-season bags are for summer, two-season bags for spring and summer, three-season bags for spring, summer, and autumn, and four-season bags for winter. |
| Gender-Based Ratings | Women's sleeping bags typically use comfort ratings due to physiological differences, while men's bags use lower limit ratings. |
| Fill Power | Down fill power is a rating system that represents the loftiness of the down in a sleeping bag. A higher fill power traps more air, providing better warmth with less filling, resulting in a lighter bag. |
| Baffles | Continuous horizontal baffles allow for adjustable warmth by moving the down insulation around as needed. |
| Hood | A hood is essential for colder temperatures, especially for wild camping in mountainous areas. |
| Weight and Packability | The weight and packability of a sleeping bag depend on its intended use. For example, a camping bag can be bulkier, while a backpacking bag needs to be lightweight and compact. |
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What You'll Learn
Sleeping bag temperature ratings are estimates
The temperature ratings on sleeping bags are meant to provide a general idea of the temperature range in which the bag is intended to be used. For example, a "'15-degree bag' is designed to keep the average sleeper warm unless the temperature drops below 15 degrees Fahrenheit. Most bags have a rating of +15 to +50 degrees Fahrenheit. It is recommended to choose a sleeping bag with a temperature rating lower than the expected temperature at your destination to ensure warmth.
The temperature ratings on sleeping bags can also be season-based. A summer bag is suitable for temperatures above 35 degrees Fahrenheit (2 degrees Celsius), while a three-season bag can be used for temperatures between 10 and 35 degrees Fahrenheit (-12 to 2 degrees Celsius). A cold-weather bag is designed for temperatures between -10 and 10 degrees Fahrenheit (-23 to -12 degrees Celsius). Four-season sleeping bags are designed for winter use, with temperatures around -10 degrees Celsius or 15 degrees Fahrenheit.
It is important to consider individual factors when choosing a sleeping bag. Some people tend to feel colder or warmer than others, so it is recommended to use comfort ratings as a baseline and select a bag with a lower temperature rating if you often feel cold. Additionally, certain features like a hood or horizontal baffles can provide more warmth. The weight, shape, and features of sleeping bags are often designed for specific activities, such as camping, backpacking, or mountaineering, so it is crucial to choose a bag suited to your intended use.
Sleeping bag temperature ratings are essential for consumers to make informed decisions when purchasing a sleeping bag. However, it is crucial to understand that these ratings are estimates, and real-world comfort may vary due to various factors. By considering individual needs, preferences, and the specific activity for which the sleeping bag is intended, one can choose the most suitable bag for their outdoor adventures.
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The meaning of bag temperature ratings
The temperature rating of a sleeping bag is a crucial factor in choosing the right one for your needs. It is a somewhat complicated subject, as there are many variables that can affect the bag's performance in the real world, which a lab test cannot simulate.
Temperature ratings are estimates, and it is important to remember that they are not precise. Lab testing involves placing a sleeping pad under the bag and dressing a test dummy in base layers. This ensures consistency across tests, but it cannot account for differences in people's body types, clothing, gear, metabolic rates, and the weather conditions they will encounter.
The comfort temperature of a sleeping bag refers to the lowest temperature at which the bag is designed to keep the average sleeper warm and comfortable, without the need for additional blankets. For example, a ""15-degree bag" is supposed to keep the user warm unless the temperature drops below 15 degrees. However, this assumes that the sleeper is wearing long clothes and using a sleeping pad, and individual factors such as age, gender, and metabolic rate can also affect how warm the bag feels.
Sleeping bag temperature ratings are also given in seasons. A one-season bag is designed for summer camping, with temperatures above 5° Celsius or 40° Fahrenheit. A two-season bag is for slightly cooler nights in spring and summer, with temperatures between 0 and 5°C (30 to 40°F). A three-season bag is for colder nights in spring, summer, and autumn, when temperatures might dip just below freezing (down to -5°C or 20°F). A four-season bag is for winter use, with temperatures as low as -10°C or 15°F.
It is recommended that if you tend to feel cold, you should choose a bag with a lower comfort rating than the coldest temperature you expect to encounter. If you sleep warm, you might be able to rely on the lower-limit ratings, but it is still advisable to give yourself a buffer of a few degrees.
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How to choose a sleeping bag
When choosing a sleeping bag, the key factor to consider is its temperature rating. This refers to the lowest temperature at which the bag is designed to keep an "average sleeper" warm and comfortable without the need for additional blankets. It's important to select a bag with a temperature rating lower than the lowest temperature you expect to encounter. For example, if you plan to camp in 15-degree weather, a bag with a 15-degree rating might be suitable. However, it's recommended to choose a bag with a lower temperature rating, as you can always unzip it if you feel too warm.
The temperature ratings on sleeping bags are based on several assumptions and may not reflect your individual comfort level. They assume the use of a sleeping pad and long clothes, and factors like age, gender, metabolic rate, and sleeping position can also affect your perception of comfort. Additionally, different brands may have variations in their testing methods, so it's a good idea to refer to lab-tested temperature ratings indicated by "EN" or "ISO" to make accurate comparisons between bags from different brands.
Sleeping bags come with different types of insulation, the most common being down and synthetic. Down insulation is generally more expensive, lighter, more compressible, and durable, retaining consistent warmth over time. It is also sought after for its higher fill power, which indicates greater warmth for its weight. However, down insulation is less ethical and performs poorly in rainy conditions. Synthetic insulation, on the other hand, stays warm even in wet weather and is more affordable, but it is heavier. The type of insulation you choose will depend on your budget, ethical considerations, and the expected weather conditions during your camping trip.
Other features to consider when choosing a sleeping bag include the outer shell material, zipper features, and additional accessories. The outer fabric is typically made of durable polyester or nylon with a water-repellent finish to protect the insulation from moisture. Look for bags with multiple zipper sliders to easily adjust ventilation and prevent snagging. Some bags also offer stash pockets for small items and stuff sacks for more compact storage. If you're camping with a partner, you can opt for double sleeping bags or rectangular bags that can be zipped together, ensuring both comfort and warmth during your outdoor adventures.
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Women's sleeping bags and comfort ratings
The key factor when choosing a sleeping bag is its temperature rating. Temperature ratings are estimates based on lab testing, which simulates how a sleeping bag should be used. A sleeping pad is placed under the bag, and a test dummy inside the bag is dressed in base layers. While this protocol ensures that all bag tests are done the same way, it can't account for individual differences in clothing, gear, body type, weather conditions, etc. Therefore, when using a sleeping bag outdoors, its comfort level may differ from its tested temperature rating.
Women's sleeping bags use the comfort rating because data shows that the "average woman" will feel colder in the same bag as the "average man." The comfort rating, which is the temperature at which colder sleepers will be comfortable, is the logical specification for women's bags. Women's sleeping bags with a comfort rating tend to weigh more than men's bags because they require more insulation to achieve the same level of warmth.
When a bag is designed as a “15-degree bag,” it means that the average sleeper would remain warm and comfortable inside the bag unless the air temperature drops below 15 degrees. These ratings assume that the sleeper is wearing long clothes and using a sleeping pad underneath. However, it's important to remember that individual factors such as age, gender, and metabolic rate can affect how someone perceives the comfort level of a sleeping bag. Therefore, it's recommended to use these ratings as a guide and always choose a sleeping bag with a lower temperature rating than your destination's expected temperature.
- Kelty Cosmic Down 20: This bag has a temperature rating of 25°F ISO Comfort and 14°F Lower Limit. It is a budget-friendly option that provides a roomy and comfortable sleeping experience.
- Sea to Summit Spark 45: This bag has a temperature rating of 12°F EN Comfort and 0°F Lower Limit. It is highly compressible and suitable for mid-summer outings at low elevations.
- Marmot Women's Teton 15°: This bag is designed for narrow-bodied people who tend to get cold at night. It is a good choice for backpacking.
- Western Mountaineering AlpinLite: This bag is lightweight and mountain-ready, featuring open baffles that allow for customizable comfort and warmth.
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Sleeping bag season ratings
Sleeping bags come with a variety of ratings and specifications, which can make choosing the right one a complicated process. Temperature ratings are a key factor when choosing a sleeping bag, and these are usually estimates based on lab testing. The temperature ratings are useful for comparing bags from different brands, but real-world comfort may differ from the lab-tested rating.
Season ratings are used to indicate the time of year for which a sleeping bag is most suitable. One-season sleeping bags are designed for summer camping and backpacking, where night-time temperatures will stay above 5° Celsius/Centigrade (approximately 40° Fahrenheit). Two-season sleeping bags are designed for slightly cooler nights in spring and summer, with a temperature range of 0 to 5°C (approximately 30 to 40°F).
Three-season sleeping bags are designed for colder nights throughout spring, summer, and autumn, when overnight temperatures might dip just below freezing (down to -5°C or 20°F). They are considered versatile and are often used as all-rounders for camping and backpacking. A three-season bag is suitable for temperatures between 10 and 35°F (-12 to 2° Celsius).
Four-season sleeping bags are designed for winter use when night-time temperatures will drop to around -10°C or 15°F. They are optimised for cold conditions, which often makes them too warm for milder seasons. The term 'five-season' is sometimes used to refer to sleeping bags designed for expeditions or high-altitude use in extremely cold temperatures.
It's important to consider your own personal internal thermostat when choosing a sleeping bag. If you often feel cold, use comfort ratings as a baseline and select a bag with a significantly lower comfort figure than the coldest expected temperature. If you sleep warm, you might rely on lower-limit ratings, but it's still recommended to give yourself a buffer of a few degrees Celsius.
Other factors to consider when choosing a sleeping bag include weight, packability, comfort, and activity. For example, a sleeping bag for camping is usually bulkier and not meant to be hauled around, whereas a bag for backpacking needs to be lightweight and easily portable.
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Frequently asked questions
The numbers on sleeping bags refer to their temperature ratings, indicating the lowest temperature the bag is intended to keep the user warm and comfortable. For example, a "15-degree bag" should keep the average sleeper warm unless the temperature drops below 15 degrees.
First, consider the lowest temperature you'll likely be sleeping in. Then, think about your personal internal thermostat—do you tend to feel cold or hot? If you often feel cold, opt for a bag with a lower comfort rating than the coldest expected temperature. If you sleep warm, you might rely on the lower-limit ratings, but it's best to give yourself a buffer of a few degrees.
Sleeping bags have season ratings that indicate the time of year they are most suitable for. For example, one-season bags are designed for summer camping, while two-season bags are for slightly cooler nights in spring and summer. Three-season bags are versatile and suitable for colder nights in spring, summer, and autumn. Four-season bags are designed for winter use in extremely cold conditions.
Apart from temperature ratings, consider the weight, packability, comfort, and intended activity. If you're camping in the front country, you might prefer a bulkier bag. For backpacking or mountaineering, you'll want a lightweight, compact bag that's easy to carry. Also, look for features like continuous horizontal baffles that allow you to adjust the insulation for warmth.
