How Do Sleeping Bags Actually Work?

If you have ever had a sleeping bag you will always be amazed at how well they work. If you are in freezing conditions they seem to keep you warm and even if the temperature is not that cold they work equally as well. Essentially they feel like they regulate the temperature pretty well, and given how small they are they seem to do an extremely efficient job at it.

Now before we get into the details of how they work, where did sleeping bags come from?

In 1876 an Euklisia Rug was patented by an entrepreneur called Pryce Pyrce Jones in 1876. This makes sleeping bags as we know them in the modern sense 142 years old! He later developed more of these bags and documents have shown (According to wikipedia – that he sold 60,000 of these to both the Russian army and the British army.

Although it can be argued that poorly made sleeping bags that were essentially wrapped blankets may have been around for a lot longer, this article will focus on the modern sleeping bag from the time of the Euklisia Rug until today.

So how does the modern sleeping bag work?

At first it seems really simple, your body omits heat and the sleeping bag keeps the heat inside itself and that hot air keeps your body warm. However if it was that simple sleeping bags would not have changed since the Euklisia Rug and yet that have changed consistently. Today’s sleeping bags can be waterproof, made from lighter and smaller material and even have the ability to create vapor barriers that air can pass through.

Now regardless of the change in sleeping bag the main two factors that control how they work are:

  • Heat Transfer – whereby the sleeping bag reduces the heat transfer from your body to the surrounding environment
  • Thermal Insulation – which works by both keeping your body heat inside the bag and keeping the colder air outside from getting in.

So how do sleeping bags work as such a good thermal insulator?

Essentially there is a material inside the sleeping bag covers that is either a natural material or a synthetic material. Likely the original thought behind the natural material was to use duck or goose feathers as these animals have lightweight feathers that keep them warm and are also waterproof. However it was finally found that sheep’s wool has one of the best insulators from water.


Now although natural materials have been used for most of their history, recently with scientific breakthroughs of materials science, synthetic material appears to outperform natural materials. The materials can rang from Polarguard to Thermolite, to others but at the end of the day they are lighter, better insulators and temperature regulators and also better at resisting water. Only issue with synthetic material is that it is usually more expensive!



Categories: Blog

Plagiocephaly Pillows

Is your baby suffering from flat head syndrome? Or maybe you are noticing slight changes in the shape of their head and are working to prevent plagiocephaly? There are many plagiocephaly pillows which take the hard work out of it and can prevent and fix your babies flat head.

Does Your Baby Have Plagiocephaly?

If your infant has plagiocephaly it will be quite obvious. A babies head is meant to be completely symmetrical so if it is beginning to change then a pillow can be a great solution. If your infant does have this condition then don’t be alarmed, a baby normally does grow out of it but if you are very concerned you can do a few things to prevent it in the first place.

The best thing you can do is tummy time, due to the amount of time your baby spends on its back applying pressure to the back of the skull tummy time is a fantastic choice. Not only will this work to prevent plagiocephaly this will also strengthen your babies neck considerably which will help with all the next milestones such as sitting, crawling, walking etc.

Best Plagiocephaly Pillows

There are many plagiocephaly pillows on the market so let’s take a look at the best of the best. Should you want to purchase a pillow to prevent or correct your babies flat head then consider the best plagiocephaly pillow on the market.

Mimos Pillow

This is considered the premium flat head pillow but this title and reputation also comes with a price tag so is it really worth the price tag?

This pillow is 100% breathable and certified as safe, it has actually been certified as the TUV certification for safe air flow as well as anti suffocation. If you are worried about SIDS or suffocation then this pillow is the perfect solution. You can even test it yourself, smother your face in it and see if you can still breath – spoiler you can !

The material is made from 3D spacer fabric which is extremely soft and will feel nice on your infants skin. This pillow will provide 400% more surface area than a regular mattress meaning the pressure is easily distributed along the infants head to prevent flat head syndrome.

As the pillows allow for 180 degree movement your baby can still move its head and neck freely allowing their neck muscles to develop perfectly.

Do I think it’s Worth It?

Absolutely. This pillow was designed by doctors, physiotherapists and neurosurgeons to keep your infants natural head shape. The fact that it comes with such high safety ratings is another testament to this product. This type of pillow is generally a preventative measure so buying one before it becomes a huge problem is crucial.

Sizes available

This pillow is availble in a variety of sizes so you can choose the best one for your infants age. There are only 4 sizes and they revised their model naming as below:

  • Mimos Pillow XS (formerly knows as Mimos L).
  • Mimos Pillow S (formerly known as Mimos XL)
  • Mimos Pillow M (formerly known as Mimos XXL)
  • Mimos Pillow L (formerly known as Mimox XXL)
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