Colin Snow
Sleeping bags come in a variety of shapes, fills, and temperature ratings. The temperature rating of a sleeping bag is the key factor in choosing one. The rating indicates the warmth and suitability of the bag for different conditions. The “20-degree” rule is a good way to ensure a good night's sleep: if you're expecting 0°F, for example, get a bag rated for -20°F. A 20°F bag will get you through most of the year. For winter camping, a true winter bag is necessary when temperatures drop below 20°F. Summer bags are typically 32°F and above, while three-season bags are 20°F to 32°F. Four-season bags are designed for winter use, and five-season bags are for expeditions in extremely cold temperatures.
Explore related products
What You'll Learn
Sleeping bag temperature ratings
When choosing a sleeping bag, the key factor to consider is its temperature rating. This is because the temperature rating of a sleeping bag indicates its warmth and suitability for different conditions.
Sleeping bags are generally rated using the EN (European Norm) or ISO (International Standards Organization) systems. Both organizations aim to standardize the method for rating the warmth of sleeping bags. While the EN system was the original standard, the ISO took over in 2017 and introduced a new standard. However, it is important to note that some prominent gear retailers do not use either of these systems and set their own temperature ratings.
Sleeping bags with EN or ISO ratings have been lab-tested, which helps curb unrealistic marketing claims and ensures the safety of users. These tests involve placing a sleeping pad under the bag and dressing a test dummy inside the bag in base layers. While this protocol ensures that all bag tests are done the same way, it cannot account for all variables, such as differences in people's clothing, gear, body types, weather conditions, and more. Therefore, the lab-tested temperature ratings may not always match real-world comfort.
Standardized laboratory tests produce a rating range for each sleeping bag, with two temperature ratings within that range: the comfort rating and the lower-limit rating. The comfort rating indicates the temperature at which a cold sleeper might feel comfortable, and it is typically used on women's bags. The lower-limit rating, which is always lower than the comfort rating, indicates the temperature at which a warm sleeper might still feel comfortable, and it is usually used on men's bags. It is important to note that these ratings are based on "average" users and should be used as a guide, considering factors such as clothing, gear, body type, weather conditions, and sleeping location.
When choosing a sleeping bag, it is recommended to consider the expected temperatures and select a bag with a comfort rating that is slightly lower than the lowest expected temperature. For example, if you plan to camp in 20-degree weather, consider choosing a bag with a 15-degree or 20-degree comfort rating. Additionally, factors such as clothing, sleeping pads, and liners can provide extra warmth, so consider these when selecting a sleeping bag.
Staying Cozy: 32-Degree Sleeping Bag Warmth
You may want to see also
Explore related products
How to choose a sleeping bag
When choosing a sleeping bag, the key factor to consider is its temperature rating. This indicates the range of temperatures that the bag is suitable for and how warm it is. Sleeping bags are generally categorised into summer, three-season, four-season, and five-season bags, with temperature ratings ranging from 32°F and above, 20 to 32°F, 0 to 20°F, and below 0°F, respectively.
For summer camping in warmer climates, a summer bag is a great option to save weight, space, and money. Three-season bags are versatile and suitable for colder nights in spring, summer, and autumn, offering a good balance between warmth, weight, and bulk. Four-season bags are designed for winter use and optimised for cold conditions, while five-season bags are for high-altitude expeditions in extremely cold temperatures.
It's important to note that temperature ratings are based on "average sleepers" and may not account for individual variations. To ensure warmth, consider choosing a bag with a rating 10-20 degrees lower than the expected lowest temperature. Additionally, look for features like a draft tube for cooler weather and a stash pocket for small items.
Another consideration is the insulation type: down or synthetic. Down insulation provides superior warmth-to-weight ratios, compressibility, and durability. It is ideal for keeping warm in dry conditions, but synthetic insulation excels in wet environments as it retains warmth when soaked through and dries faster than down. Synthetic bags are also more affordable and ethical due to the absence of animal products.
Finally, sleeping bags come in various shapes, including snug mummy and roomy rectangular designs. Rectangular bags offer ample space to stretch out and can sometimes be fully unzipped into a comforter. Mummy bags, on the other hand, are more snug and suitable for backpacking as they are lighter and more compact.
Double Sleeping Bag System: Why and When?
You may want to see also
Explore related products
$80.93 $106.49
Sleeping bag shapes
Sleeping bags come in various shapes, each with its own set of advantages and disadvantages. Here is a detailed description of the most common sleeping bag shapes:
Rectangular
Rectangular sleeping bags are the most traditional and common type of sleeping bag. They offer ample room for legs and arms to stretch out and move around. Some rectangular bags can be fully unzipped and used as a comforter, making them ideal for warm-weather camping. They are a good choice for campers who prioritize comfort over warmth. Rectangular sleeping bags are usually bulkier and heavier than other shapes, making them more suitable for car camping than backpacking.
Semi-Rectangular (Modified Mummy or Barrel)
Semi-rectangular sleeping bags offer a compromise between warmth and roominess. They are generally more slender than rectangular bags, with a rounded top and a slight taper at the bottom. This shape provides extra shoulder room, making them a good option for side sleepers. Semi-rectangular bags are well-suited for cool-weather camping when conditions are chilly but not extremely cold. They come in a variety of shapes, and some models may be more similar to mummy bags, while others may be closer to rectangular bags.
Mummy
Mummy sleeping bags are designed to boost warmth and reduce weight. They have a slim cut and a snug fit, typically allowing the sleeper to roll over with the bag rather than inside it. Mummy bags usually have a contoured hood that can be cinched tight for added warmth. The fitted shape maximizes heat retention by minimizing the amount of air space around the body. This makes them ideal for bitterly cold conditions and a popular choice for backpackers as they are lighter and more compact than rectangular bags. However, the snug fit may not be comfortable for everyone, especially those who prioritize roominess and the ability to move around.
Double
Double sleeping bags are designed for couples and offer a wider option than the standard sleeping bag. They typically come in a rectangular shape but can also be found in barrel and mummy shapes. Some single rectangular bags can be zipped together to form a double bag, but they need to be the same model and brand. Double sleeping bags provide a cozy option for couples who want to sleep together while camping.
In addition to these basic shapes, sleeping bags also come in different sizes, such as regular, long, and short, to accommodate people of various heights. Women's sleeping bags are specifically engineered to fit the contours of the average woman's body, with narrower shoulders and wider hips. Kid-sized sleeping bags are shorter, smaller, and more affordable variations of adult sleeping bags, often featuring fun prints, patterns, and colors.
Switching Off Work Thoughts: A Guide to Peaceful Sleep
You may want to see also
Explore related products
Lab-tested temperature ratings
Sleeping bag temperature ratings are based on standardised laboratory tests. The tests produce a rating range for each sleeping bag, with two temperature ratings within that range: a comfort rating and a lower-limit rating. The comfort rating indicates the temperature at which a cold sleeper might feel comfortable. This is the rating used for women's sleeping bags. The lower-limit rating, which is always lower than the comfort rating, indicates the temperature at which a warm sleeper might still feel comfortable. This is the rating used for men's sleeping bags.
It's important to note that temperature ratings are estimates and are based on an "average sleeper". Lab testing simulates how a sleeping bag should be used, with a test dummy inside the bag dressed in base layers. While this protocol ensures consistency across bag tests, it doesn't account for all variables, such as differences in clothing, body types, weather conditions, and more. Therefore, real-world comfort may not always match lab-tested temperature ratings.
The EN (European Norm) and ISO (International Standards Organization) ratings are widely used and provide standardised methods for rating the warmth of sleeping bags. EN was the original standard, but in 2017, ISO introduced a new standard, ISO 23537. These ratings are useful for making comparisons between sleeping bags from different brands. However, not all manufacturers use the EN or ISO system, and their ratings should be considered with caution.
When choosing a sleeping bag, it's recommended to select one with a rating that is lower than the expected lowest temperature. For example, if you anticipate temperatures of 20 degrees Fahrenheit, choose a bag with a rating of 15 or 20 degrees. Additionally, consider your sleeping environment, clothing, and other factors that can impact your comfort.
Mattress Stealing Sleep? Get a Good Night's Rest Tonight!
You may want to see also
Explore related products
EN and ISO ratings
Sleeping bags are now independently tested and provided with a "comfort" and "limit" rating. The EN/ISO testing protocols are a standard for all sleeping bags. The ratings from this test allow users to reliably compare bags of similar ratings and safely choose a bag that suits their needs.
The EN 13537 standard was introduced in 2005 to ensure that consumers could directly compare sleeping bags of a given rating. The EN standard was originally adopted by the sleeping bag industry, but now a new entity, the ISO (International Standards Organization), oversees bag testing. The ISO update was introduced in 2017 as an updated version of the EN ratings. Both systems are still in use, and they are broadly similar.
The EN and ISO tests use a heated mannequin fitted with 15 temperature sensors to represent a sleeping person. The mannequin is dressed in a baselayer top, tights, long socks, and a hat, then placed inside the sleeping bag on top of a closed-cell foam sleeping mat inside a cold chamber. As the ambient temperature drops, measurements are recorded via the sensors on the mannequin. The tests produce a rating range for each sleeping bag, with two temperature ratings within that range: a comfort rating and a lower limit rating. The comfort rating indicates the temperature at which a cold sleeper might feel comfortable. The lower limit rating (which is always lower than the comfort rating) indicates the temperature at which a warm sleeper might still feel comfortable.
The comfort rating is based on the air temperature at which the "average female" can sleep comfortably through the night without curling up for warmth. The lower limit rating is based on the temperature at which the "average man" can maintain his thermal equilibrium in a curled-up position. He might not be comfortable at this temperature, but he is not in danger of hypothermia.
The Magic of Sleeper Bunks: Transforming Spaces for Restful Nights
You may want to see also
Frequently asked questions
There are three types of sleeping bag temperature ratings: the EN (European Norm) rating, the ISO (International Standards Organization) rating, and non-EN/ISO ratings.
It is recommended to choose a sleeping bag with a temperature rating that is at least 20 degrees Fahrenheit lower than the lowest temperature you expect.
The comfort rating is the temperature at which a cold sleeper might feel comfortable, and it is typically used for women's sleeping bags. The lower-limit rating is the temperature at which a warm sleeper might still feel comfortable, and it is usually used for men's bags.
In addition to temperature ratings, consider the type of insulation (down or synthetic), the shape (mummy or rectangular), and the intended use (camping or backpacking).
If a sleeping bag has an EN or ISO rating, it has been lab-tested. These ratings are based on standardised tests that simulate how a sleeping bag is used, including the use of a sleeping pad and base layers.
