ROCK FRONT 650 Ultralight down sleeping bag
453.17$
Lightweight down sleeping bag for sub-zero temperatures. Easy to use as a blanket, quilt, or hammock underquilt.
Sleeping Bags
Choose your sleeping bag size
Take measurements and select the required settings to determine the size of your sleeping bag correctly.
Select your measurements
- A - body height from the top of the head to the heels, measure without shoes.
- B - measure horizontally with your hands at the level of your chest.
- C - measure horizontally at the most protruding part of the hips.
* Data are measured in centimeters
You can also use the chart below:
| Width (circumference) / Height | Shoulder: up to 110 cm / Hip: up to 100 cm | Shoulder: 111-130 cm / Hip: up to 120 cm | Shoulder: 131-150 cm / Hip: up to 140 cm |
|---|---|---|---|
| up to 164 cm | S Medium | M Short | |
| 165-176 cm | M Medium | L Short | |
| 177-188 cm | M Long | L Medium | |
| 189-197 cm | L Long |
- If your height is on the borderline of sizes (for example 176 cm), you can choose M Medium or L Short. If your height is 177 cm and above, choose between M Long and L Medium.
- If your width parameters are close to the limit (1-4 cm) and you need additional internal space, choose a wider size.
More warmth, wider range
Down sleeping bag in 10D nylon micro ripstop with center-zip convertible mummy bag design. Filled with 650g of 900+ FP hydrophobic goose down and built with mesh box baffles for strong warmth, low weight, and extra flexibility across a wider range of conditions.
-8°C / -13°C
830-1135g
900+ FP
YKK #3 detachable two-way
7 sizes
23 х 19 x 19 cm
Adjustable hood
Warm hood with simple adjustment for a closer fit and better protection in cold weather.
Wide insulated collar
Helps seal in warmth around neck and upper chest and reduces heat loss during sleep.
Center zip
Long two-way center zip makes it easy to vent heat, open bag as a blanket, or connect it to another compatible sleeping bag.
Read more
Insulated draft tube
Wide insulated draft tube along zipper helps reduce drafts and improve warmth retention.
Read moreAnatomical footbox
Shaped footbox gives feet more natural space and helps maintain warmth more efficiently.
Anti-snag zip guard
Helps zipper run smoother and keeps lightweight fabric from catching during use.
Read moreUnderquilt-compatible design
Reinforced loops let you set it up as a hammock underquilt when needed.
Read moreInternal zip pocket
Keeps small essentials close through the night.
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ROCK FRONT 650 Ultralight is built for winter trips, cold off-season use, and mountaineering. Center-Zip Convertible Mummy Bag concept gives it more versatility than a standard mummy sleeping bag, making it easy to use as a warm sleeping bag, a blanket, a quilt, or a hammock underquilt.
Anatomical mummy shape helps retain warmth, while long center zip makes temperature control easier. You can vent heat from top or foot end by opening zipper partway. In warmer conditions, bag can be opened fully and used as a blanket.
Special elastic loops let you attach bag to sleeping mat in quilt mode when you want more room inside while still keeping better draft control. Reinforced loops also allow 650 Ultralight to be used as a hammock underquilt.
Insulated with premium 900+ fill power goose down, it stays warm, lightweight, and compact at the same time.
Use case
- as a mummy sleeping bag for maximum warmth
- as a blanket for warmer nights
- as a quilt with Quilt Set Upgraded
- as an underquilt for hammock camping with Underquilt Set Upgraded
- zipped together with another compatible sleeping bag from Ultralight line
Set includes
- sleeping bag
- compression sack
- mesh storage sack
* Total weight can vary by up to 2%.
** We continuously improve our products and reserve right to change configuration, accessories, colors, and fabric shades.
- ultralight and packable
- insulated with 900+ Fill Power hydrophobic goose down
- mesh box baffles for even insulation and quick loft recovery
- DWR-treated down and shell fabric
- underquilt-compatible design
- compatible with other sleeping bags from Ultralight line
- anti-snag zipper guard for smoother, easier zip use
- internal zip pocket
- anatomical footbox
- wide insulated draft tube along zipper
- wide insulated collar
- adjustable hood
- long center zip for easy ventilation and blanket-style use
Temperature rating (Tcomfort / Tlimit): -8°C / -13°C | 17°F / 9°F
Insulation: 900+ Fill Power Hydrophobic Goose Down
Shell / lining: 10D Nylon Micro Ripstop DWR
Zipper: YKK #3 detachable two-way zipper
Weight
- S Medium: 830 g (insulation: 565 g) / 29.28 oz (insulation: 19.93 oz)
- M Short: 900 g (insulation: 610 g) / 31.75 oz (insulation: 21.51 oz)
- M Medium: 965 g (insulation: 650 g) / 34.04 oz (insulation: 22.93 oz)
- M Long: 1015 g (insulation: 690 g) / 35.79 oz (insulation: 24.34 oz)
- L Short: 1025 g (insulation: 695 g) / 36.16 oz (insulation: 24.52 oz)
- L Medium: 1080 g (insulation: 730 g) / 38.10 oz (insulation: 25.75 oz)
- L Long: 1135 g (insulation: 770 g) / 40.02 oz (insulation: 27.16 oz)
Compression sack: 60 g / 2.12 oz
Packed size: 23 x 19 x 19 cm / 9.1 x 7.5 x 7.5 in
Manufacturer: ROCK FRONT, Ukraine
Composition
100% nylon shell & lining / goose down insulation
Safety
PFAS-free / OEKO-TEX® Standard 100 / PFC-free DWR
Care note
Dry fully after every trip. Store loose, dry, and uncompressed — in a mesh storage bag or fully lofted. Do not store long-term in a compression sack. Learn more
Wash at 30°C
Do not bleach
Tumble dry low
Do not iron
Do not dry clean
Oleksiy –
I recently bought this bag. The quality, like everything else from this manufacturer, is top. Not yet tested in trip, but the first impression is wow!!!
Dmytro –
The sleeping bag is cool, it proved itself well in the winter Carpathians, I plan to test it in combination with a quilt in colder temperatures!
Ksenia –
Thank you very much for a quality product made in Ukraine! On the advice of a friend, I paid attention to this sleeping bag, and I’m happy with the purchase. Everything matches the description, high quality, and very pleasant to the touch. Looking forward to larger sizes to order another one.
Miles –
From the beginning of my backpaking life, I wanted to buy a down sleeping bag. It takes up much less space and is more pleasantly warm compared to synthetics. It retains its temperature characteristics longer.
I bought the sleeping bag as a basis for a sleeping system for all seasons. Next in line is a quilt with a sheet. I think 350 Pro will be just right. And then let the people from RockFront tell me whether the internal space of the quilt will be enough for this sleeping bag.
I tested the sleeping bag in two hikes.
The first one was on Kukul. We spent the night in kolybas, so we didn’t even put the tent out.
But the second one was a test)
Overnight on Mount Velykyi Verkh at a temperature of about 10 degrees below zero.
I also used a fleece liner.
I’ll say this, it was close to the capabilities of the sleeping bag at that moment. I slept well, did not freeze.
All this is subjective and cannot be used as a guide.
Thank you Rock Front for making backpaking accessible. Thank you for developing and improving.
Update: review of the previous version
Lars Anton Mattsson –
Really enjoyed the sleeping bag. It’s so light yet incredibly fluffy. Only problem I’ve had so far is that it’s so hard to close the zipper the last centimeters on the top, yet it’s even harder to get it back open. Might have been a manufacturing issue with mine. But for the price it’s a superb investment.
Store manager ROCK FRONT –
Thank you for the review! I’m glad you liked the sleeping bag. I apologize for the inconvenience with the zipper — it’s a self-locking zipper and can sometimes snag when closing. We’ll work on resolving this.