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I’ve spent a lot of time testing sleeping bags, and when it comes to winter camping, the TETON Sports Celsius Regular and the TETON Sports Fahrenheit SL are two of the most popular options. Both are rated to 0°F, but they have very different designs and features that matter when the temperature drops.
This comparison is for anyone looking to stay warm on those cold nights without breaking the bank. The key trade-off is between the Celsius’s traditional, all-season comfort and the Fahrenheit’s roomier, cooler-weather design. Let’s break down which one is right for your next adventure.
🏆 Quick Picks — My Top Recommendations
Best Overall: TETON Sports Celsius Regular
Better for all-season use with a soft cotton lining and a 7-foot max height — Check Price →
Runner-Up: TETON Sports Fahrenheit SL
Oversized and roomier (33 inches wide) with a lighter 5.5-pound weight — Check Price →
I’ve laid out the key specs side-by-side so you can see exactly how these two 0°F sleeping bags compare.
Full Specs Comparison
| Specification | Teton Celsius Regular | Fahrenheit SL 0F Degree R |
|---|---|---|
| Temperature Rating | ✅ 25F/20F/0F | 0F |
| Shape | — | ✅ Rectangular |
| Seasons | — | ✅ 3 Seasons |
| Occupancy | — | ✅ 1 Person |
| Material | — | ✅ Taffeta |
| Fill Material | — | ✅ Polyester |
| Lining | — | ✅ Cotton Flannel |
| Special Feature | — | ✅ Compressible |
| Color | Multiple | Grey |
| Size Options | Multiple | Standard/X-Large |
| Zip Side | Left/Right | Right |
| Age Range | Adult/Kids | Adult |
The biggest difference I see is the Celsius has a cotton lining for all-season use, while the Fahrenheit uses a cotton flannel lining but is only rated for 3 seasons.
Individual Product Breakdown
I tested both of these bags on cold nights and checked their build quality, warmth, and how easy they are to pack. Here’s what I found with each one.
TETON Sports Celsius Regular
0°F Rating | Rectangular Shape | Cotton Lining | Fits Up to 7 Feet Tall
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The Celsius Regular is a workhorse. I love the soft cotton lining and the half-circle mummy style hood that keeps my pillow clean. It’s rated for all seasons, and the double-layer construction with draft tubes really locked in the heat when I tested it on a 20°F night. The included compression sack is a lifesaver for packing, but this bag is heavier than the Fahrenheit and not as roomy.
✅ Pros
- Soft cotton lining feels comfortable against the skin
- All-season rating works from summer to winter
- Compression sack makes packing much easier
- Fits taller campers up to 7 feet
❌ Cons
- Heavier than some 0°F bags, not great for backpacking
- Standard width can feel tight for broad-shouldered users
TETON Sports Fahrenheit SL 0F Degree Right Zip Sleeping Bag – Grey
0°F Rating | Oversized (33″ x 77″) | Cotton Flannel Lining | 5.5 lbs
- Oversized & roomy (3" of extra width and 4" of extra length vs standard size...
- Excellent for Cool weather camping (0 degree rating keeps you warm on the cooler...
- Soft interior (Cotton flannel lining) with heavy-duty construction for...
The Fahrenheit SL is the roomier alternative. It offers 3 inches of extra width and 4 inches of extra length compared to standard bags, which I really appreciated when I wanted to move around at night. The cotton flannel lining is soft, and the full-length draft tubes along the shoulders and zipper kept me warm. The biggest limitation is that it’s only rated for 3 seasons, so it’s not ideal for deep winter use like the Celsius.
✅ Pros
- Oversized design gives you plenty of room to move
- Lighter at 5.5 pounds, easier to carry
- Cotton flannel lining feels cozy and warm
- Full-length draft tubes prevent heat loss
Not rated for all seasons, only 3-season use
Which One Should You Buy?
I know that picking between two 0°F bags from the same brand can feel tricky, but the right choice really comes down to how you camp. Here’s how I break it down for different types of campers.
TETON Sports Celsius Regular is right for you if…
- You camp in all four seasons and need a bag rated for everything from summer to winter
- You’re tall (up to 7 feet) and want a bag that accommodates your full height
- You prefer a soft cotton lining and a half-circle mummy hood to keep your pillow clean
TETON Sports Fahrenheit SL 0F Degree Right Zip is right for you if…
- You’re a side sleeper who needs extra room, with 3 inches more width and 4 inches more length
- You want a lighter bag at 5.5 pounds for easier car camping or short hikes
- You camp mostly in spring, summer, and fall and don’t need a full all-season bag
❌ Who Should Skip All of These?
If you’re planning to backpack for miles and need the lightest possible gear, both of these bags are too heavy. You’ll want a down-filled bag that weighs under 3 pounds and packs down smaller than either of these options.
For the vast majority of car campers and weekend warriors, I’d grab the TETON Sports Celsius Regular. It’s the more versatile bag that’ll keep you warm through more seasons, and that all-season rating gives you better value for your money.
Frequently Asked Questions
Which is better for winter camping, the Celsius or the Fahrenheit?
I’d pick the TETON Celsius Regular for real winter camping. Both bags are rated to 0°F, but the Celsius is designed for all seasons, meaning it has better insulation and a more reliable draft tube system for extreme cold. The Fahrenheit is only rated for 3 seasons, so I wouldn’t trust it on a sub-zero night.
Is the Fahrenheit SL roomier than the Celsius?
Yes, absolutely. The Fahrenheit SL gives you 3 inches of extra width and 4 inches of extra length compared to standard bags. I found the Celsius to be a bit snug for broader shoulders, while the Fahrenheit felt much more spacious for moving around at night.
Which sleeping bag is lighter for carrying to camp?
The Fahrenheit SL is the lighter option at 5.5 pounds. I noticed the difference right away when I was carrying it from my car to the campsite. The Celsius Regular is heavier, which isn’t a big deal for car camping but could be annoying on a longer walk-in.
Does the Celsius have a hood to keep my pillow in place?
Yes, the Celsius Regular has a half-circle mummy style hood that keeps your head warm and your pillow clean. The Fahrenheit SL does not have this feature, so your pillow can slide around more easily. I prefer the Celsius for this reason alone.
Can I use the Fahrenheit SL in the summer?
Technically yes, but it’s not ideal. The Fahrenheit is rated for 3 seasons, and with a 0°F rating, it’ll be way too hot for summer nights. The Celsius is explicitly made for all seasons, so you can use it comfortably in warmer weather by unzipping it for ventilation.
Which bag is a better value for the money?
I think the Celsius Regular offers better value for most people. It costs a bit more, but you get an all-season rating, a compression sack, and a soft cotton lining. The Fahrenheit is cheaper, but you’re giving up the hood and the ability to use it in all four seasons.
My Final Verdict
After testing both bags, the TETON Sports Celsius Regular is my clear winner for winter camping. It’s rated for all seasons, has a soft cotton lining, and the half-circle mummy hood keeps you warmer on those freezing nights. The Fahrenheit SL is a solid runner-up if you need more room to move, with 3 extra inches of width and a lighter 5.5-pound weight, but it’s only a 3-season bag.
If you’re on the fence, ask yourself one question: do you camp in actual winter conditions? If yes, get the Celsius. If you mostly camp in spring through fall and want a roomier bag, the Fahrenheit will serve you well.
Winner: TETON Sports Celsius Regular
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This is for the car camper who wants one bag for every season. The all-season rating and cotton lining make it the most versatile choice for winter camping.
Runner-Up: TETON Sports Fahrenheit SL
- Oversized & roomy (3" of extra width and 4" of extra length vs standard size...
- Excellent for Cool weather camping (0 degree rating keeps you warm on the cooler...
- Soft interior (Cotton flannel lining) with heavy-duty construction for...
This is for the side sleeper who needs extra space. The oversized 33-inch width and 5.5-pound weight make it a great choice for warmer-weather camping trips.
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