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- How to choose a sleeping bag: RELIEVER Sleeping Bag, Smart Sleeping Bag and ZUBORA compared
Sleep. Wrap. Wear.How to choose a sleeping bag: RELIEVER Sleeping Bag, Smart Sleeping Bag and ZUBORA compared
RELIEVER sets your body free from the cold. Three shapes, chosen by how you use them.
SleepRELIEVER Sleeping Bag
WrapSmart Sleeping Bag
WearZUBORA Stadium Coat- Sleep
To sleep soundly until morning at camp: the RELIEVER Sleeping Bag. A proper sleeping bag rated EN Comfort 4°C / Lower Limit -1°C. - Wrap
For a lap blanket, poncho or inner bag: the Smart Sleeping Bag. A light blanket-style bag (S size approx. 350 g) that changes shape as you need it. - Wear
To wear it and do everything in one piece: the ZUBORA Stadium Coat Sleeping Bag. Carry your warmth with you, like a stadium coat.
All three are made in Japan by ISHIKEN, a bedding maker founded in 1925 in Fukuyama, Hiroshima, using Air Flake® fill. Fully machine washable.
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RELIEVER Sleeping Bag
The warmest of the three, a proper sleeping bag for camping. Roomy at 85 cm wide, and it unzips fully into a quilt.
4°CComfort
-1°CLower limit
1.4 kgWeight
Smart Sleeping Bag
One piece that becomes a lap blanket, poncho or sleeping bag. Also an inner bag for the RELIEVER, or for naps in the car.
350 gS size
3 in 1Cover, wrap, sleep
ZipJoin any number
ZUBORA Stadium Coat Sleeping Bag
A wearable sleeping bag that does it all. Walk, work, then fall asleep, all without taking it off.
980 gRegular
3-wayWear, cover, sleep
CertifiedPhase Free
The same warmth, in three shapes
RELIEVER Sleeping Bag
Sleep soundly until morning, outdoors and at camp.
4°CComfort
-1°CLower limit
1.4 kgWeight
- Tent camping
- Unzips fully into a quilt
- Zip two together for a double
- Machine washable
ZUBORA Stadium Coat Sleeping Bag
One piece that does it all. Carry your warmth with you.
980 gRegular
740 gJunior
-20°C1-hour indoor sleep test
- Watching sports
- Outings
- Sleeping in the car
- Evacuation shelters
- Phase Free certified
How cold can the RELIEVER go?
- Comfort temperature
- The temperature at which you can sleep in a relaxed position without feeling cold.
- Lower limit temperature
- The temperature at which you can sleep for 8 hours curled up.
- Extreme temperature
- A 6-hour survival guide only. Not a temperature for comfortable sleep.
Ratings follow the international standard EN ISO 23537. Use the comfort and lower limit temperatures when choosing. On colder nights, add the Smart Sleeping Bag inside as an inner bag for extra warmth. The Smart Sleeping Bag and ZUBORA do not carry EN ratings.
* Temperatures are guides based on test conditions. How warm you feel depends on clothing, sleeping mat, wind and your own body.
Compare the three
Scroll the table sideways on mobile.
| RELIEVER Sleeping Bag | Smart Sleeping Bag | ZUBORA | |
|---|---|---|---|
| Type | Sleep: proper sleeping bag (boot-shaped foot) | Wrap: blanket and sleeping bag | Wear: wearable sleeping bag (3-way) |
| Main use | Outdoors, camping | Lap blanket, poncho, inner bag, naps | Sports, outings, car camping, shelters |
| EN ISO 23537 | Comfort 4°C / Lower limit -1°C Extreme -16°C |
Not rated | Not rated |
| Weight | Approx. 1.4 kg | S approx. 350 g / L approx. 480 g | Approx. 980 g (Junior approx. 740 g) |
| Size | Approx. 85 × 210 cm Fully open approx. 170 × 210 cm |
S approx. 100 × 140 cm L approx. 115 × 175 cm |
Regular / Junior (up to about 150 cm tall) |
| Walk while wearing | No | Partly (draped over shoulders) | Yes |
| Zip together | Two make a double | Any number | No |
| Colors | Indigo Navy Pearl Gray |
Brown Khaki Silver Beige |
Indigo Navy Pearl Gray |
| Phase Free certified | No | Yes | Yes (PF0125052) |
| Fill / washing | Air Flake® (100% recycled polyester). All three are fully washable in a laundry net. | ||
| Price (tax incl.) | 29,800 yen | S 19,800 yen L 24,200 yen |
33,000 yen Junior 24,200 yen |
| Buy | View | S / L | View |
"Phase Free" is a Japanese certification for products that are useful in everyday life and also serve you in an emergency, so you are prepared without stockpiling.
Which one for which scene
Camping
Sleep in the RELIEVER. On cold nights, add the Smart Sleeping Bag inside.RELIEVERSmart
Car camping
Seated naps: Smart. Often stepping outside: ZUBORA.SmartZUBORA
Winter sports
Wear it in the stands. Junior size for kids.ZUBORA
Emergencies
Two Phase Free certified products you use daily and keep ready.ZUBORASmart
Buy now
Free shipping within Japan on orders of 33,000 yen (tax incl.) or more.
- RELIEVER + Smart Sleeping Bag: an inner bag at night, a lap blanket by day. Your cold-weather camping set in one.
- Two Smart Sleeping Bags: zip them together into a large quilt for two.
- ZUBORA Adult + Junior: for parents and kids at games and campsites.
For shipping, payment and returns, see our shopping guide.
Frequently asked questions
Which should I choose: RELIEVER, Smart Sleeping Bag or ZUBORA?
Choose the RELIEVER Sleeping Bag to sleep soundly through the night when camping. Choose the Smart Sleeping Bag if you want one piece that switches between lap blanket, poncho and inner bag. Choose the ZUBORA Stadium Coat Sleeping Bag if you want to wear your warmth like a stadium coat and do everything in one piece.
Which sleeping bag is the warmest?
The RELIEVER Sleeping Bag has the highest insulation. Under EN ISO 23537 it is rated Comfort 4°C, Lower Limit -1°C and Extreme -16°C.
How can I use the Smart Sleeping Bag?
It changes shape between a lap blanket, a poncho and a sleeping bag. It also works as an inner bag for the RELIEVER and for naps in the car, and several can be zipped together into a queen-size quilt. Available in S (approx. 350 g) and L (approx. 480 g).
Is there a sleeping bag I can walk around in?
Yes. The ZUBORA Stadium Coat Sleeping Bag has arm zips and an adjustable hem, so you can walk and work while wearing it, then sleep in it as it is. The regular size weighs approx. 980 g.
Is there a children's size?
ZUBORA comes in a Junior size for children up to about 150 cm tall (approx. 740 g).
Can they be washed?
All three are fully washable in a laundry net. If you tumble dry, we recommend a large dryer at a coin laundry.
Which is best for sleeping in the car?
For seated naps between drives, the compact Smart Sleeping Bag. If you often step out of the car or go to the restroom, the wearable ZUBORA.
Which is best for emergencies and evacuation shelters?
ZUBORA, because you can move around in it with both hands free. Together with the light, portable Smart Sleeping Bag, both are Phase Free certified, so you can use them every day as warm wear or a lap blanket and be prepared at the same time.
Portable warmth, made by a futon factory in Fukuyama
ISHIKEN has been making futons in Fukuyama, Hiroshima since 1925. Our Air Flake® fill is light and fluffy like down, sheds far less fiber and dust, and can be fully washed at home.
Still not sure which is right for you?
Tell us where and when you will use it, and your height. We will help you choose. We are happy to answer in English by email.
Ask us by email
