Ashwin Lewis
Sleeping bags come with a comfort rating, which indicates the lowest temperature at which the average cold sleeper (usually a woman) can sleep comfortably in the bag. This is the temperature you can rely on for a good night's sleep without shivering or needing extra layers. The comfort rating is the temperature for colder sleepers and is the rating that's more commonly used for women's sleeping bags. The comfort rating is based on a standard woman who isn't shivering in a relaxed posture. This is different from the lower limit rating, which is the temperature at which a warm sleeper might still feel comfortable and is the rating that is often used for men's bags. The lower limit rating is based on a standard man who is curled up inside the sleeping bag and not shivering. It's important to note that these ratings are just guides, and real-world comfort may differ from the tested temperature rating.
| Characteristics | Values |
|---|---|
| Purpose of comfort rating | Indicates the lowest temperature at which the average cold sleeper can sleep comfortably in the bag without shivering or needing extra layers. |
| Who is the comfort rating for? | Cold sleepers, usually women. |
| Who is the lower limit rating for? | Warm sleepers, usually men. |
| Lab testing | Sleeping bags are tested in labs with dummies in the same conditions, dressed in the same base layers, and at the same temperature. |
| Lab testing limitations | Labs cannot simulate all real-world variables, such as differences in clothing, gear, body types, weather conditions, and food. |
| Standardized temperature rating systems | EN 13537 and ISO 23537 (International Standards Organization) |
| EN 13537 standards | Upper Limit, Comfort, and Lower Limit. |
| ISO 23537 standards | Comfort and Lower Limit. |
| Additional considerations | Age, gender, and metabolic rate vary from person to person and can affect their perception of comfort. |
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What You'll Learn
- Sleeping bag temperature ratings are estimates, not precise measurements
- Lab-tested ratings are useful for comparisons, but real-world comfort may differ
- Comfort ratings indicate the temperature at which a cold sleeper might feel comfortable
- Lower limit ratings indicate the temperature at which a warm sleeper might still be comfortable
- Physiological differences, clothing, and gear can affect individual comfort levels
Sleeping bag temperature ratings are estimates, not precise measurements
Sleeping bag temperature ratings are estimates and should be used as a guide. They are based on standardised laboratory tests, which produce a rating range for each bag. The comfort rating indicates the temperature at which a cold sleeper might feel comfortable, and the lower limit rating indicates the temperature at which a warm sleeper might still be comfortable. These ratings are based on a "standard woman" and a "standard man", respectively, with the woman not shivering "in a relaxed posture" and the man sleeping for eight hours "in a curled position without waking".
However, it's important to remember that these ratings are not precise measurements. The laboratory tests simulate how a sleeping bag should be used, with a sleeping pad placed under the bag and a test dummy inside dressed in base layers. While this ensures consistency across tests, it doesn't account for all real-world variables. For example, people have different clothing and gear, body types, metabolic rates, and sleep differently. The weather and environmental conditions can also vary, and these factors can significantly impact the actual comfort level of a sleeping bag.
Additionally, the temperature ratings on sleeping bags are often rounded up or down to the nearest 0 or 5, and the numbers on bag names don't always match the exact temperature ratings. For example, a bag named the "Men's Snugglebuggle 15 Bag" might have an ISO lower-limit rating of 18 degrees Fahrenheit. Therefore, it's essential to look at the actual test rating on the bag, rather than relying solely on the marketing or branding.
When choosing a sleeping bag, it's important to consider your sleeping habits, expected weather conditions, and personal comfort level. If you tend to sleep cold, focus on the comfort rating, and if you sleep warm, the lower limit rating may be sufficient. Remember that the extreme rating is a survival metric and not a measure of comfort. It's always better to err on the side of caution and choose a bag with a lower temperature rating than you think you need. You can always unzip the bag for air circulation if you're too warm, but if you're too cold, you're in for an uncomfortable night.
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Lab-tested ratings are useful for comparisons, but real-world comfort may differ
Lab-tested ratings are useful for making comparisons between sleeping bags from different brands. However, it's important to remember that these ratings are estimates and may not perfectly match your real-world comfort level. Here's why:
Firstly, the lab-tested temperature ratings, indicated by "EN" (European Norm) or "ISO" (International Standards Organization) ratings, are based on standardised tests. These tests involve placing a sleeping bag with a dummy inside on a pad, with the dummy dressed in base layers. While this ensures consistency across brands, it doesn't account for individual variations. For example, people have different metabolic rates, and factors such as clothing, gear, body type, weather conditions, and food intake can also affect how warm or cold someone feels.
Additionally, the numbers on bag names might not always match their exact temperature ratings. Brands often round up or down to a number that ends in 0 or 5 for simplicity, so it's important to look at the actual test rating on the bag. For instance, a 15-degree bag means it should keep the average sleeper warm unless the temperature drops below 15 degrees. However, this assumes certain conditions, such as the sleeper wearing long clothes and using a sleeping pad, and individual factors can still affect how comfortable someone feels.
Furthermore, the comfort rating, which is commonly used for women's bags, and the lower limit rating, often used for men's bags, are based on average physiological differences between traditional genders. The comfort rating is for colder sleepers, while the lower limit rating is for warmer sleepers. However, not everyone fits neatly into these categories, and individual variations can still affect their comfort level.
Lastly, it's worth noting that not all sleeping bags have an ISO or EN rating. These ratings are not applicable to bags designed for extreme cold, children's bags, or bags intended for mild conditions or casual use. In these cases, the temperature ratings provided by brands may be estimates rather than lab-tested ratings, and should be used as guidelines rather than absolute comparisons.
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Comfort ratings indicate the temperature at which a cold sleeper might feel comfortable
Sleeping bags have temperature ratings that indicate the level of warmth and comfort they provide. These ratings are determined through standardised laboratory tests, which involve placing a dummy inside the bag, dressed in base layers, and exposing it to different temperatures. The tests produce a rating range for each sleeping bag, with two specific temperature ratings: the comfort rating and the lower limit rating.
The comfort rating indicates the temperature at which a cold sleeper might feel comfortable. This rating is commonly used for women's sleeping bags, as data shows that the "average woman" will feel colder in the same bag as the "average man". The comfort rating is designed to ensure a good night's sleep without shivering or needing extra layers. It is suitable for general outdoor use and provides reliable warmth.
The comfort rating is particularly important for cold sleepers, who should focus on this rating when choosing a sleeping bag. It is also essential to consider the expected weather conditions and your personal sleeping habits. If you tend to sleep warm, the lower limit rating may be sufficient, as it indicates the temperature at which a warm sleeper can still be comfortable.
It is worth noting that the temperature ratings on sleeping bags are estimates and may not perfectly match your real-world experience. Variables such as clothing, gear, body type, weather conditions, and individual differences can affect your comfort level. Therefore, it is recommended to use the ratings as a guide and choose a sleeping bag with a lower temperature rating than you anticipate needing to ensure a restful night's sleep.
Additionally, the temperature ratings on sleeping bags are often rounded up or down to the nearest 0 or 5 for simplicity. Therefore, it is advisable to look at the actual test rating rather than relying solely on the number in the bag's name. By understanding the comfort rating and considering your personal needs, you can select a sleeping bag that provides the warmth and comfort you require for a good night's sleep during your outdoor adventures.
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Lower limit ratings indicate the temperature at which a warm sleeper might still be comfortable
Sleeping bags have different temperature ratings that indicate the level of warmth and comfort they offer. The comfort rating of a sleeping bag indicates the lowest temperature at which the average cold sleeper can sleep comfortably in the bag. This is usually the temperature rating used for women's sleeping bags. The comfort rating is based on a standard woman who is able to sleep comfortably in a relaxed position without shivering or needing extra layers.
The lower limit rating, on the other hand, is the temperature at which a warm sleeper might still be comfortable. This is typically the temperature rating used for men's sleeping bags. The lower limit rating is based on a standard man who is able to sleep for eight hours in a curled position without waking or feeling uncomfortably cold. While the sleeper might not feel cozy, they should be able to sleep through the night without significant discomfort.
It's important to note that these ratings are estimates and may not reflect the exact temperature at which every individual feels comfortable. Factors such as age, gender, metabolic rate, clothing, gear, body type, and weather conditions can all impact how warm or cold someone feels in a sleeping bag. Therefore, it's always a good idea to choose a sleeping bag with a lower temperature rating than the expected conditions and to use the ratings as a guide rather than a guarantee.
Additionally, the temperature ratings on sleeping bags are determined through standardized laboratory tests, where each bag is tested with a dummy in the same conditions, such as wearing the same base layers and at the same temperature. The EN (European Norm) and ISO (International Standards Organization) are the standard testing methods used by most brands to assign temperature ratings to their sleeping bags.
In summary, the lower limit rating of a sleeping bag indicates the temperature at which a warm sleeper might still be comfortable. This rating is typically used for men's sleeping bags and is based on the assumption that a "standard man" can sleep for eight hours without waking or feeling uncomfortably cold. However, individual factors can also impact the level of comfort, so it's important to consider your own sleeping habits and preferences when choosing a sleeping bag.
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Physiological differences, clothing, and gear can affect individual comfort levels
Sleeping bags are designed to keep users warm and comfortable without the need for additional blankets. However, physiological differences, clothing, and gear can affect individual comfort levels.
Physiological Differences
The comfort rating of a sleeping bag is influenced by physiological differences between individuals, such as age, gender, and metabolic rate. For example, data shows that the "average woman" will feel colder in the same bag as the "average man". This is why women's sleeping bags typically use the comfort rating, which is the temperature for colder sleepers.
Clothing
The type and amount of clothing worn inside a sleeping bag can also impact comfort levels. While wearing more clothes can provide additional warmth, too much clothing might compress the sleeping bag's insulation and impede blood flow, resulting in a colder sleep. Clothing can also trap body moisture, and damp clothes can lead to a chill. Therefore, it is recommended to maximise insulation and use extra clothing to supplement the bag's insulation if needed.
Gear
The use of additional gear, such as sleeping pads, can also affect comfort levels. A sleeping pad placed under the bag can provide insulation and enhance comfort. In cold weather, it may be more economical to carry an extra sleeping pad instead of a warmer sleeping bag or more clothes.
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Frequently asked questions
The comfort rating on a sleeping bag indicates the lowest temperature at which the average cold sleeper (usually a woman) can expect to sleep comfortably without shivering or needing extra layers.
Most sleeping bag manufacturers follow a standardized temperature rating system known as EN 13537 or ISO 23537. These international standards help provide consistent information, so consumers can compare sleeping bags across brands with confidence. The comfort rating is determined in a lab setting, where each bag is tested with a dummy in the same conditions, such as wearing the same base layers and at the same temperature.
Choosing the right sleeping bag temperature rating is about matching the bag to your needs, environment, and personal comfort level. If you tend to sleep cold, focus on the comfort rating; if you sleep warm, the limit rating may be enough for you.
