Ashwin Lewis
When hiking in Colorado during the summer, it's important to consider the temperature rating of your sleeping bag. The temperature can vary greatly depending on the altitude and variation between night and day. For example, if you're hiking the Colorado Trail, which stretches from Denver to Durango and winds through the Rocky Mountains, you'll often be at heights of 10,000 feet or higher, where nights can be chilly, even in summer. To prepare for these colder nights, a bag rated to 20 degrees Fahrenheit would be more than adequate, providing warmth without being too hot. However, some hikers who run hot may prefer a 30-40 degree bag, as they can always bundle up with layers if needed. Additionally, down-fill bags are ideal for their lightweight and warmth, but synthetic bags retain warmth when wet and are more affordable.
| Characteristics | Values |
|---|---|
| Temperature rating | 20°F–30°F, with some suggestions of 0°F or lower |
| Weight | Less than 3 pounds is preferable |
| Insulation | Down is lighter and more compact but more expensive and less effective when wet; synthetic retains warmth when wet and is more affordable |
| Shape | Rectangular, semi-rectangular, or "mummy" |
| Zipper | Multiple sliders make it easy to adjust ventilation; a full-length guard prevents snagging |
| Hood | A snug-fitting hood can make the bag warmer |
| Storage | A stuff sack for transportation and a storage sack to protect the bag when not in use |
| Liner | Adds warmth and keeps the bag clean |
| Pad | A sleeping pad can add warmth and comfort |
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What You'll Learn
Sleeping bag temperature ratings
The bag industry has agreed to test bags in the same way for all brands. Most brands send their sleeping bags to an independent test lab that assigns bag temperature ratings. The EN (European Norm) was the original standard adopted by the sleeping bag industry. Now, the ISO (International Standards Organization) oversees bag testing, using a very similar method to the EN test. Lab-tested temperature ratings (indicated by "EN" or "ISO") are useful for comparing sleeping bags from different brands.
There are three main rating categories: international standards from EN or ISO, trustworthy homebrew ratings (usually from cottage companies), and untrustworthy companies who cheat the system. EN and ISO tests include using a heated mannequin wearing light clothing and a well-insulated pad. The tests produce a rating range for each sleeping bag, with two temperature ratings within that range:
- Comfort rating: the temperature at which a cold sleeper might feel comfortable. This is the rating used for women's bags.
- Lower limit rating: the temperature at which a warm sleeper might still feel comfortable. This is the rating used for men's bags.
It is important to remember that temperature ratings are estimates, not exact guarantees. Lab testing simulates how a sleeping bag should be used, but it cannot account for all variables, such as differences in people's clothing, gear, body types, weather conditions, and more. Therefore, when you use your sleeping bag outdoors, its comfort level may differ from its tested temperature rating.
Now, let's apply this knowledge to choosing a sleeping bag for a summer in Colorado. The Colorado Trail traverses the Rocky Mountains, with most of the trail at 10,000 feet or higher. Nights can be chilly, especially after mid-August, but it won't be extremely cold. If you're a cold sleeper, a bag rated to 20 degrees Fahrenheit should be adequate—warm enough for cold nights, but not too hot for warmer nights. A 30-degree bag could also work for summer, especially if you plan to sleep below 10,000 feet. If you want a bag that will work for spring and fall as well, consider a 15-degree bag.
In conclusion, when choosing a sleeping bag for Colorado summers, consider the temperature ratings and your personal preferences for warmth. A bag rated to 20 or 30 degrees Fahrenheit should suffice for summer, with a lower rating needed for spring and fall. Remember that you can always unzip your bag if you get too warm.
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Sleeping bag materials
The temperature in Colorado during the summer varies. In July, the temperature is generally warm, but it can get cold at night, especially at higher elevations. In August, the temperature starts to cool down at night, and by September, it is much colder. Therefore, a sleeping bag with a temperature rating of 20°F to 30°F should be adequate for a Colorado summer. However, if you plan to hike at higher elevations, you may need a bag with a lower temperature rating.
When choosing a sleeping bag, it is important to consider the materials used, as this will affect the bag's weight, warmth, durability, and breathability. Here are some common materials used in sleeping bags:
Down
Down sleeping bags are filled with the fluffy plumes that serve as an undercoat for geese and ducks. The best down has the most plumes and the least quill, providing higher fill powers. Down bags are lightweight and warm, making them ideal for summer in the Rockies. However, they tend to be more expensive than synthetic bags. Down bags use a system of baffles or tubes to hold the down in place. Sewn-through baffles are used in warm-weather bags, while vertical baffles provide better insulation for colder weather.
Synthetic
Synthetic sleeping bags are made from materials like Polarguard Delta fill. They are often lighter in weight and able to retain heat even when wet. Synthetic insulations are usually secured via a system of quilting, shingling, or layering. Synthetic bags are generally more affordable than down bags and are a good choice for backpackers due to their ease of packing and transportation.
Cotton Flannel
Cotton flannel is a natural material that is soft and warm, making it a comfortable option for sleeping bags. However, it can be heavier, which may not be ideal for backpacking.
Canvas
Canvas sleeping bags, such as those made from cotton canvas, are durable and provide excellent insulation and warmth. They are ideal for cold weather conditions and can withstand wear and tear from rough terrain. Canvas is a breathable material that helps prevent condensation and keeps you dry and comfortable.
Nylon, Polyester, and Taffeta
These synthetic materials are commonly used in sleeping bag shells to protect the exterior from moisture and prevent the migration of insulating materials. They are often treated with a DWR (Durable Water Repellent) finish to enhance their moisture protection.
When choosing a sleeping bag, it is important to consider the shape as well. Rectangular bags offer more room to move around, while semi-rectangular or "modified mummy" bags provide a compromise between warmth and roominess. Mummy bags are snug to conserve warmth and reduce weight, making them popular for backpacking.
Additionally, features like a full-length zipper, anti-snag strips, and a zipper baffle can help reduce heat loss. A pillow pocket and a tech pocket for your phone are also convenient features to look for.
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Sleeping bag shapes
When choosing a sleeping bag for a summer trip to Colorado, it's important to consider the temperature ratings, type of insulation, and shape of the bag. While the ideal temperature rating for a sleeping bag varies depending on individual preferences and the specific locations and altitudes visited, a bag rated to 20°F to 30°F is generally recommended for summer in Colorado.
Now, let's delve into the different shapes of sleeping bags and how they can impact your comfort and warmth:
Rectangular Sleeping Bags
Rectangular sleeping bags are the classic shape that comes to mind when thinking about sleeping bags. They offer ample room for both legs and arms to stretch out and move around. Some rectangular bags can be completely unzipped and used like a comforter, making them ideal for warm-weather camping when there is a need to cool down. They are a popular choice for campers who prioritize comfort and space over warmth. Rectangular bags tend to be bulkier and heavier due to their larger size.
Semi-Rectangular or Modified Mummy Sleeping Bags
Semi-rectangular sleeping bags, also known as "modified mummy" or "barrel" shapes, offer a compromise between warmth and roominess. They are structurally similar to mummy bags but do not conform tightly to the body. These bags come in a variety of shapes, mostly slender with a rounded top and tapered bottom. They are well-suited for cool-weather camping when conditions are chilly but not extremely cold. Semi-rectangular bags provide extra shoulder room, making them a good option for side sleepers.
Mummy Sleeping Bags
Mummy sleeping bags are designed with a snug fit to maximize warmth and minimize weight. They are shaped to follow the contours of the human body, and the hood can be cinched tight for added warmth. With this fitted shape, you are likely to roll over with the bag rather than inside it. Mummy bags are highly effective at retaining heat by minimizing the amount of air space around your body. This makes them lighter than roomier bags, and a popular choice for backpackers. However, they may not be ideal for those who prioritize space and the ability to move around.
Double Sleeping Bags
Double sleeping bags are designed for couples who want to sleep together while camping. They typically come in a rectangular shape but with double the width of a standard bag. Some double sleeping bags feature zippers on both sides for easy entry and exit. You can also create a DIY double sleeping bag by zipping together two single-sized rectangular bags of the same brand and model.
In addition to these standard shapes, sleeping bags also come in kid-sized versions, which are shorter and smaller, making them more affordable and available in fun prints and colors.
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Sleeping bag weight
When it comes to sleeping bags, weight is an important consideration. The weight of a sleeping bag is influenced by various factors, including the type of insulation, shell and lining fabrics, shape, and temperature rating.
The insulation is a critical factor in determining the weight of a sleeping bag. Down insulation, made from duck or goose feathers, is known for its excellent warmth-to-weight ratio. It is lightweight, lofty, and provides superior warmth by trapping body heat effectively. However, down insulation is generally more expensive and requires careful treatment to maintain its performance, especially in wet conditions. On the other hand, synthetic insulation is more affordable and continues to insulate better when wet. While it may add a little extra weight, it is a viable option for those who prioritize cost and moisture resistance over having the lightest option.
The shell and lining fabrics also contribute to the overall weight of the sleeping bag. Manufacturers of lightweight sleeping bags use thin and delicate fabrics to minimize weight while still providing sufficient protection. However, these thin fabrics may be more prone to tears and damage, requiring careful handling.
The shape of the sleeping bag also affects its weight. Mummy bags, designed to follow the body's contours, are often lighter due to their streamlined design, which reduces excess fabric. In contrast, rectangular bags tend to have more fabric and, therefore, weigh more. Additionally, features like a built-in hood or draft collars can add weight but also enhance warmth and comfort.
Temperature rating plays a crucial role in sleeping bag weight. As a general rule, the lower the temperature rating, the heavier the sleeping bag. This is because warmer bags require more insulation and shell fabric to achieve the desired warmth. For summer use in Colorado, a temperature rating of around 20°F to 35°F is generally recommended, with some hikers opting for ratings as low as 15°F or as high as 40°F. It's worth noting that a sleeping bag's temperature rating may not always align perfectly with the actual temperature, and individual factors such as whether you sleep hot or cold should be considered.
When choosing a sleeping bag, it's essential to strike a balance between weight and warmth. Ultralight sleeping bags, weighing under 10 lbs, are ideal for backpacking and hiking as they minimize pack weight and space. However, they tend to be more expensive due to the advanced construction methods and materials used. If weight is less of a concern, a heavier sleeping bag can provide more room and comfort, which may be preferable for car camping or base camping. Ultimately, the decision comes down to personal preferences, the intended use, and your budget.
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Sleeping bag ventilation
When hiking in Colorado during the summer, it is recommended to bring a sleeping bag rated to 20°F. While the days will be warm, the nights can be chilly, especially at higher elevations. If you are a cold sleeper, a 20°F bag will keep you warm without being too toasty.
Foot Vents
Some sleeping bags come with foot vents, which allow you to stick your feet out for cooling. These vents can be found at the bottom of the zipper, letting you kick your feet out to cool off and then sealing up to retain heat when needed. Big Agnes sleeping bags, for example, have zippers that run to the end of the bag, making it easy to vent the footbox.
Zipperless Bags
Another option is to go for a zipperless sleeping bag. Sierra Designs, for instance, offers bags that replace the zipper with an oversized comforter. This allows for unrestricted movement and more comfortable sleep. The comforter seals up with the rest of the bag to keep the heat in.
Self-Sealing Vents
Sierra Designs also features a patented self-sealing foot vent. This vent lets you stick your feet out to cool off and automatically seals when not in use, conserving heat.
Venting Techniques
If your sleeping bag does not have built-in vents, you can employ some simple techniques to improve ventilation:
- Unzip the bag: If your bag has a zipper, simply unzipping it partway can provide ventilation while still keeping you covered.
- Use a liner: A liner can add a layer of insulation, allowing you to stay warm while keeping the bag unzipped.
- Choose a lighter bag: Opting for a lighter sleeping bag can provide more ventilation. For example, a 30°F bag is often sufficient for summer use, and you can always add layers if needed.
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Frequently asked questions
The best temperature for a sleeping bag depends on the individual. Some people prefer a 20°F bag for the summer in Colorado, while others use a 30-40°F bag. If you are a cold sleeper, a bag rated to 20°F would be more than adequate—warm enough for cold nights, but not so toasty you’ll overheat when the temps are higher. If you are a hot sleeper, a 30-40°F bag is recommended.
Down sleeping bags are typically lighter and more compact than synthetic insulation. They are also warmer compared to synthetic filling of the same weight. However, down insulation can be more expensive and less effective when wet.
Synthetic insulation retains its warmth when wet and is typically more affordable. Synthetic bags are also better for sleeping in wet and rainy conditions. However, synthetic insulation is bulkier and heavier than down.
Other factors to consider include the shape of the bag, weight, packability, and price. If you are backpacking, you will want a lightweight and compact sleeping bag. If you are car camping, you can choose a warmer and roomier bag without worrying about bulk or weight.
