Ashwin Lewis
When choosing a sleeping bag, there are many factors to consider, such as its temperature rating, insulation type, shape, and weight. However, one crucial aspect that is often overlooked is the R-value of the sleeping pad. The R-value measures the sleeping pad's ability to insulate you from the ground and prevent heat loss. A low R-value can cause discomfort and even hypothermia in freezing temperatures, while a higher R-value will provide better insulation and warmth. This is important because the insulation of a sleeping bag works by trapping warm air, and the weight of your body can affect its ability to trap heat underneath you. Thus, a sleeping pad with a higher R-value can offset a sleeping bag's low R-value by providing additional insulation from the ground.
| Characteristics | Values |
|---|---|
| R-value | Indicates a sleeping mat's ability to insulate from the cold ground and provides a standardised measurement to gauge how effective it will be in low temperatures. |
| Sleeping bag temperature rating | Identifies the lowest temperature at which a bag was designed to keep an "average sleeper" warm. |
| Comfort rating | Measures the lowest temperature where the "average" woman will be comfortable, relaxed, and not feel cold. |
| Lower limit rating | Measures the lowest temperature where the "average" man will sleep comfortably, without shivering. |
| Extreme rating | Measures the lowest temperature a woman can survive using the sleeping bag. |
| Factors affecting comfort | Warmth of the sleeping bag, metabolism, sleeping position, weather, etc. |
| Sleeping bag insulation | Down or synthetic insulation. |
| Sleeping bag shape | Snug mummy or roomy rectangular shape. |
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What You'll Learn
The R-value of a sleeping pad is its resistance rating
When choosing a sleeping pad, it is important to consider the R-value that is suitable for your needs. The R-value required will depend on factors such as external conditions, individual differences, and your sleep system setup. If you are a cold sleeper or often feel chilly at night, you should opt for a sleeping mat with a higher R-value. Conversely, if you tend to run hot and are prone to overheating, a lower R-value mat may be more suitable.
The R-value of a sleeping pad also affects the temperature rating of a sleeping bag. Sleeping bag manufacturers often assume the use of a sleeping pad with an R-value of 5.38 or more in their temperature ratings. If your sleeping pad has a lower R-value, you may experience colder sleep, and your sleeping bag may not feel as warm.
In some cases, upgrading your sleeping pad to one with a higher R-value may provide more benefit than switching to a higher temperature-rated sleeping bag. The thickness of an inflated sleeping pad is not always indicative of its warmth, as some pads may be filled with air while others have insulative material. Therefore, it is essential to consider the R-value when selecting a sleeping pad that will provide sufficient insulation for your needs.
Additionally, it is worth noting that the R-value of a sleeping pad and the temperature rating of a sleeping bag work together as an integrated system. By choosing a suitable R-value for your sleeping pad, you can ensure that your sleep system provides optimal warmth and comfort during your outdoor adventures.
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A low R-value sleeping pad can compromise a sleeping bag's warmth
A sleeping bag's temperature rating assumes that it is being used with a sleeping pad that has an R-value of 5.38 or higher. R-value refers to the insulation level of a sleeping pad, or how much it protects you from heat loss as temperatures get colder. Pads with higher R-values will keep you warmer in colder weather than those with lower R-values.
If your sleeping pad has a low R-value, it can compromise the warmth of your sleeping bag by more than 20 degrees. This is because the insulation of your sleeping bag works by trapping air, especially when it is warmed by your body. However, the weight of your body prevents warm air from being trapped inside the insulation underneath you, so the insulation of your sleeping bag is doing less to keep you warm.
Therefore, a low R-value sleeping pad can compromise a sleeping bag's warmth. If you sleep cold, you may benefit more from upgrading your sleeping pad to one with a higher R-value rather than investing in a more expensive sleeping bag.
It is important to note that the R-value of a sleeping pad is not the only factor that affects your comfort when sleeping outdoors. Other variables include the warmth of your sleeping bag, your metabolism, your sleeping position, and the weather. Additionally, the type of insulation in your sleeping bag (down or synthetic) and the shape (mummy or rectangular) can also impact its warmth and comfort.
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Sleeping bag temperature ratings are based on average sleepers
Sleeping bag temperature ratings are based on the assumption that the user is an "average sleeper". However, it is important to note that there is no standard definition of an "average sleeper", and ratings can vary between manufacturers. Generally, the temperature ratings are based on the assumption that the sleeper is wearing a base layer and long underwear (top and bottom) and a warm hat. The ratings also take into account the insulation provided by a sleeping pad with an R-value of 5.38 or more.
The EN Rating scale is a scientific test used to determine the warmth of a sleeping bag and produces two ratings: a Lower rating for male sleepers and a Comfort rating for female sleepers. The Lower rating is based on the assumption that a "standard man" will be sleeping for six hours in a curled-up position inside the sleeping bag without shivering. The Comfort rating is based on a "standard woman" who is sleeping for eight hours in a relaxed position without shivering. These ratings are then used to determine the temperature range for which the sleeping bag is suitable.
It's important to note that these ratings are just guidelines and may not accurately reflect the comfort level of the user in the outdoors. Individual factors such as metabolism, sleeping position, and clothing can also affect how warm or cold a person sleeps. Additionally, the thickness of a sleeping pad when inflated is not a good indicator of its warmth, as some inflatable pads are filled with nothing but air while others are filled with insulative material.
When choosing a sleeping bag, it is recommended to consider the temperature rating as a rough guideline rather than an absolute comparison to similar bags from other brands. Other factors such as the type of insulation (down or synthetic), the shape of the bag (mummy or rectangular), and the user's sleeping habits should also be taken into account. It may be more beneficial to upgrade your sleeping pad to one with a higher R-value before investing in a higher temperature-rated sleeping bag.
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Sleeping bag insulation works by trapping air
Sleeping bags are designed to trap a layer of warm air between your body and the bag's walls. This trapped air is warmed by your body, and the more of it there is, the warmer the sleeping bag gets. This is why sleeping bags are often likened to human thermoses.
The insulation of a sleeping bag, whether down or synthetic, works by trapping air. Down insulation is made from the small, fluffy feathers found on birds, usually ducks or geese. Synthetic insulation, on the other hand, is typically made from polyester. While down insulation is warmer by weight, more compact, and longer-lasting, it is also more expensive and less durable. Synthetic insulation is more affordable and ethical but less durable and bulkier.
The way the layers of insulation are constructed also affects how well the sleeping bag retains warmth. Basic synthetic bags use flat layers of insulation, while better-quality bags use layers sewn diagonally over one another, called shingles. Sea to Summit bags have a unique construction that creates curves of insulation to trap extra air, called WaveLoft™.
It's important to note that the sleeping bag's shape and fit can also impact its ability to retain warmth. A very narrow sleeping bag may suggest greater warmth due to less "dead air", but in practice, the insulation can be flattened by the sleeper's hips and knees, creating cold spots. A sleeping bag that is too tight around the shoulders and elbows can also compress the insulation.
Additionally, the sleeping pad used in conjunction with the sleeping bag plays a significant role in overall warmth. The R-value of a sleeping pad measures its insulation level and resistance to heat loss. A higher R-value indicates greater insulation and resistance to colder temperatures. If the R-value of the sleeping pad is lower than expected, it can compromise the warmth of the sleeping bag. Therefore, upgrading to a higher R-value sleeping pad may be more beneficial than investing in a higher-temperature-rated sleeping bag.
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Synthetic insulation is cheaper but down is more popular
Synthetic insulation is cheaper, but down is more popular. This is because down is a superior insulator, being both warmer and lighter than synthetic materials. Down is the plumage found underneath the exterior feathers on waterfowl such as ducks and geese. It consists of soft, fluffy, wispy filaments that trap air and body heat, creating high-loft clusters that keep air and body heat from escaping.
The warmest, lightest down comes at a premium price because it is sourced from mature geese, which have a very fine construction. Duck down is less fine, slightly less insulating, and therefore less expensive. However, duck down is still a high-quality product that meets the same testing and performance standards as goose down.
Down is also incredibly breathable, allowing it to wick away moisture from the body. However, it struggles to insulate when wet and is slow to dry. This is where synthetic insulation has an advantage. Synthetic insulation is designed to replicate the qualities of down, trapping heat in air pockets using polyester fibers of different sizes that are arranged in intertwined, lofty clusters. Synthetic insulation is quick-drying and continues to insulate even when soaked.
Overall, down is the better insulator and is therefore more popular, despite its higher price tag. However, synthetic insulation is a good alternative for those who expect to encounter wet weather, as well as those on a budget.
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Frequently asked questions
R-value refers to the resistance rating of a sleeping pad, which measures how well it prevents cold from the ground from reaching the side you're sleeping on.
The R-value of your sleeping pad is the most important factor in keeping you warm. A low R-value can compromise the warmth of your sleeping bag by more than 20 degrees.
The R-value you need depends on external conditions, individual differences, and your sleep system setup. If you're prone to overheating, go for a lower R-value. If you often need extra blankets, choose a higher R-value.
Consider the bag's temperature rating, insulation type, weight, and additional features. Choose a bag with a temperature rating slightly lower than the typical low temperatures you expect. If you're backpacking, also consider the bag's weight and packed size.
The Mountain Hardwear Bishop Pass 15 is a good budget option with a solid warmth-to-weight ratio. The OutdoorZ Redwood is another warm option, best suited for higher elevations and cooler climates.
