Sleepthru Aerotemp Sleeping Bag

Smart temperature-regulating technology designed to help prevent overheating and chilling for more comfortable sleep.

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Color: Sage

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Description

Featuring Outlast® temperature-regulating technology, this smart fabric actively balances body heat: absorbing excess warmth, storing it, and releasing it back as needed. Originally developed by NASA for use in spacesuits, it helps your baby maintain an ideal sleeping temperature all night long, reducing the risk of overheating or waking from chills.

Made from 100% organic cotton, the SleepThru Sleeping Bag is soft, breathable, and free from harmful materials. It’s fully tested to EN16781 safety standards, so you can rest assured your baby is sleeping safely.

With clever poppers at the armholes and back, this bag adjusts as your child grows, providing a perfect fit from 3 to 24 months. A practical two-way zipper makes nighttime changes simple, so you can get baby back to sleep with minimal disruption.

Choose between Summer Nova for warmer nights or a Winter Orbit, cosier bag for cooler months, with two calming colourways to suit every nursery.

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Size

Suitable from 3 months (or 5KG) to 24 months

Safety Information

Fully tested to EN16781 safety standards, so you can rest assured your baby is sleeping safely.

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Designed With Intention

Buttery Soft Cotton

Made from 100% organic GOTS-certified cotton that’s ultra-soft, breathable and gentle on delicate skin.

Easy Night Changes

A clever two-way zipper allows for quick nappy changes with less disturbance during the night.

Grows With Your Baby

Designed to fit from 3–24 months, with cleverly placed poppers for a safe, adjustable fit.

What parents ask the most...

What makes temperature-regulating sleeping bags better for babies?

Babies can’t control their temperature well because their little bodies lose heat quickly and can’t sweat or cool down as efficiently as adults. Our bag helps keep them comfy by absorbing extra heat when they’re warm and releasing it back if they cool down, so they stay settled and sleep better.

Why doesn’t this sleeping bag have a TOG rating?

Traditional TOG ratings work for fabrics that stay the same warmth all night. Our bag is made with Outlast® technology, which actively stores and releases heat to keep your baby’s temperature more stable. Because it adapts as they sleep, a single TOG number wouldn’t be accurate (or helpful!).

Instead, just check our simple clothing guide and room-temperature tips, they’ll help you dress your little one safely and comfortably without worrying about a fixed TOG.led and sleep better.

Should I choose summer or winter?

Because the fabric adapts to your baby’s temperature, you don’t need to worry as much as with TOG bags, but winter is a little heavier and cosier and suitable if the room temp goes below 20 degrees.

Was this really made by NASA?!?!

Yes — the Outlast® technology inside our sleeping bags was originally created under a NASA space programme. It was designed to help astronauts stay comfortable when temperatures in space shift quickly. We’ve taken that same clever heat-balancing tech and woven it into baby sleepwear, so your little one can stay more comfortable while they sleep.

Customer Reviews

Verified Customer Reviews

Reviews for Sleepthru Aerotemp Sleeping Bag

See what customers are saying about this product.

Fiona My

Reviewed in the United Kingdom on 17 May 2026

★ ★ ★ ★ ★

✓ Verified Purchase

Great Quality

I think this is a really great quality baby sleeping bag, that is well made and seems to be comfortable for my daughter. I like the feel of the material, which is organic cotton, which will be soft on my daughters skin. I like the temperature regulating technology, as my daughter can get very warm at times so this will help regulate the temperature. I also found the zip very handy for nappy changes.

Reviewed in the United Kingdom on 4 May 2026

★ ★ ★ ★ ★

✓ Verified Purchase

Soft, cosy, and surprisingly thoughtful

In those early months, we’ve been constantly checking whether our daughter was too hot or too cold, but this baby sleep bag took the guesswork out of it. The season choice option (we got the winter) means we don't have to layer blankets or stress about loose covers. The material is soft — like a gentle hug — and our daughter settles faster and stays asleep longer. The size is generous without being baggy. Our daughter is tall for her age, and the 6–12 month size still leaves room to grow. After weeks of nightly use, the fabric has stayed plush, and the colour hasn't faded. More than just cosy, it's given us better sleep knowing she's safe and comfortable. A well‑made baby sleep bag that does exactly what it should. Recommended.

Mr Tee

Reviewed in the United Kingdom on 15 April 2026

★ ★ ★ ★ ★

✓ Verified Purchase

Comfortable Sleep Sack with decent Temperature Control

The AeroTemp Baby Sleeping Bag immediately comes across as a comfort focused baby sleeping bag option, especially with its temperature regulating design. The material feels soft and breathable, and the use of organic cotton adds a bit of reassurance when it comes to what is in contact with the baby’s skin. In daily use, the temperature control aspect makes a noticeable difference, helping avoid overheating or getting too cold during the night. It maintains a more balanced feel rather than needing constant adjustments with extra layers. The fit allows for natural movement while still keeping everything secure, which is important for uninterrupted sleep. The two way zip is practical and makes changes easier without fully removing the sleep sack. It feels well designed for everyday use, combining comfort with convenience in a way that actually helps during those routine night time checks. Not bad at all

Chen350181

Reviewed on April 5, 2026

★ ★ ★ ★ ★

✓ Verified Purchase

Make Comfortable Sleep

The sleeping bag is soft and comfortable, and the material feels gentle on the baby’s skin. It provides a good level of warmth without overheating, which is important for safe sleep. The design also makes it easy to put on and take off. Sizing is adjustable which make it last longer. Just want to say if could add removable sleeves would be nicer. Anyway is a reliable and cozy option for babies.

The Frugal Yorkshire couple

Reviewed on March 1, 2026

★ ★ ★ ★ ★

✓ Verified Purchase

Clever temperature-regulating sleep sack soft, practical, and works year-round.

I picked this up for our little grandson, and as someone who’s a bit of a sucker for all things technology—especially anything with space heritage—the Outlast® connection definitely caught my attention.

Freckle Snitches

Reviewed on March 4, 2026

★ ★ ★ ★ ★

✓ Verified Purchase

Pricey but very nice baby sleep sack

Beautiful soft and cosy baby/toddler sleep sack. It’s the gorgeous soft fabric. Perfect level of comfort and warmth. My 2 year old fit in it perfectly and looked super cosy and comfy. The print is lovely on it as well. At the time of ordering was priced at £59.99. Which honestly is utterly ridiculous price to pay for a baby sleep sack. The sleep sack is of very high quality but still unsure if it warrants that price.

Adėlė

Reviewed on March 16, 2026

★ ★ ★ ★ ★

✓ Verified Purchase

Amazing Baby Sleeping Bag

This baby sleeping bag came very well packaged and seems to have very good quality. It is made of 100% organic cotton, it is very soft, breathable, thick,skin friendly and looks very pretty with the dizanj small austronaut dhe yjet e vogla. This sleeping bag is sleeveless, has two way zipper closure which is very practical and helps a lot in changing diapers at night without disturbing the baby's sleep. The sleeping bag is for ages 3-24 months, it is quite big but having poppers on the back can be smaller to be used when they are little baby. It is a very good sleeping bag, it is skin friendly, comfy and warm for the cold winter days. With my son when he was little it was always a problem to cover him with a blanket because he moved a lot and took it off so I had to wake up all the time and cover him well but now with my little girl I found the solution with this sleeping bag with which I will not worry that she could feel the cold at night.Also this sleeping bag it washes very well. It's perfect for small babies, but the price is a bit high in my opinion.

Emma

Reviewed on March 12, 2026

★ ★ ★ ★ ★

✓ Verified Purchase

Lightweight, temperature-regulating sleep sack

This baby sleeping bag is soft and breathable, made from 100% GOTS-certified organic cotton. The Outlast® technology helps regulate temperature, keeping infants comfortable without overheating, which is particularly useful during warmer months.

Sarah M.

Reviewed on March 12, 2026

★ ★ ★ ★ ★

✓ Verified Purchase

Excellent quality

The product quality is better than expected. It looks premium, works well, and I would recommend it.

How Aerotemp™ Technology Helps Regulate Temperature

Heat Release

Excess heat is released from the body

Heat Storage

Heat is absorbed and stored by the fabric

Cooling Comfort

Body cools down naturally

Adaptive Warmth

Fabric releases heat back when needed

Balanced Sleep

Body’s microclimate stays balanced

Parent Approved

Simple Returns

Premium Quality

Intentionally Designed

Why SLEEPTHRU® is different

Temperature Regulating

Requirement for numerous different TOGS

Adjustable Sizing

Requirement for numerous sizes.

GOTS organic cotton

Cotton that's been treated with chemicals and metals.

Dual Zip access

Difficult to change nappy at night.

Sleepthru Aerotemp Sleeping Bag