Dagsmejan’s cool pyjamas just got even cooler
26.6.2026
Translation: Megan Cornish
Pictures: Martin Jungfer
Weren’t pyjamas perfected a long time ago? No. Dagsmejan proves that on a regular basis. For nights in warm bedrooms, there’s a new pyjama set with innovative fabric that allows you to sleep soundly. I tried them out.
First, I have to confess something: I haven’t slept in cotton pyjamas for years. The days of them being the ultimate option are definitely over for me. I switched to functional underwear a while ago – not just for sports, but also to sleep in.
Several manufacturers now make non-cotton pyjamas, but the pioneer’s Swiss brand Dagsmejan. Obviously, I’m interested in their latest invention, Staycool Air. Staycool’s been on the market since 2021, while the addition of «Air» promises even greater breathability for a comfortable night’s sleep.
The company sent me a set of shorts and a shirt to test. On unboxing, my initial impression’s positive. The lyocell fibre – made from eucalyptus using a chemical process – feels as soft as silk. But the fabric looks different from the «old» Staycool nightwear I usually wear: much more textured, with fine pores.
For the Air collection, Dagsmejan uses a three-dimensional, more open structure. It traps significantly more air, improving air circulation between your body and surroundings. I can actually feel this during the tropical nights of the June heatwave. Even in a bedroom measuring 25 degrees Celsius, I fall asleep surprisingly quickly. And, most importantly, I sleep through the night. In the morning, the Air pyjamas are completely dry. So, either I didn’t sweat at all, or the perspiration was effectively wicked away. Just like it does with good shirts during exercise.
Weight isn’t everything
I was somewhat surprised by the weight of the Air pyjamas. I’d expected the fabric to be lighter than that of the previous Staycool collection, but the new shirt weighs in at 154 grammes – a fifth more than the old one (128 grammes). The reason lies in how the fabric’s made, as Dagsmejan CEO Andreas Lenzhofer explained when I asked him. It requires slightly more material for the three-dimensional structure, resulting in a higher area density. Andreas said:
«What matters most for comfort isn’t so much the weight on the scale, it’s significantly higher breathability and faster heat and moisture transport.»
And these aren’t just marketing clichés. Dagsmejan works closely with EMPA – the ETH Zurich’s research institute for materials science – to develop its products. This allows the company to boast impressive «better than» comparative figures. The breathability of the pyjama fabrics, for example, is measured using standardised methods. According to these measurements, the Air material is 14 times more breathable than conventional cotton and eight times more breathable than the standard Staycool fabrics.
Inspired by these figures, but in a completely unscientific way, I got out an old pair of cotton pyjamas and blew warm air through them with my mouth. Then I did the same with the Staycool Air Shirt. Yes, there’s a difference. Feel free to try it yourself…
Loose, not snug
There’s also a difference in fit. The familiar Staycool shirts and shorts are «slim» fit. This suits me perfectly with my ectomorphic build – I’m quite tall and slim. For now at least, the Air collection’s only available in «regular» fit, which is a bit looser.
I don’t really notice the size difference with the t-shirt. Size L’s loose on me (I’m 1.91 metres tall and weigh 83 kilogrammes), but it’s not too big. However, I look like I’m about to take to the basketball court in size L shorts. A size M would have been big enough.
Dagsmejan designed the fit to be «deliberately slightly less form-fitting», explains CEO Andreas. This supports airflow when many people use fans to circulate the air in their bedrooms on hot nights.
The relaxed fit also means elastane isn’t required. The Air collection’s made from 100 per cent lyocell.
Made in Europe
Dagsmejan’s asking some hefty prices for its science-backed sleepwear. You have to be willing – and able – to pay them.
It’s good to know that anyone who buys a top or bottoms from Dagsmejan’s getting a product that’s made in Europe. The fabric for the Staycool Air collection’s knitted and dyed in Portugal. The company’s found a partner there who’s mastered the special technology. The yarn’s also spun there. Finally, the garments are assembled in Romania, where they’re sewn together and packaged for sale.
In a nutshell
Even better
I thought I already had the perfect pyjamas for warm summer nights: my Staycool ones. I assumed adding Air to the name was a marketing gimmick. After testing them, I know better. The fabric’s a blend of waffle weave and mesh, and it really makes a difference to my sleep. And because my sleep is sacred to me, I’ll probably have to add to my Dagsmejan collection soon.
Pro
- Sustainable and ethically certified production in Europe
- Skin doesn’t feel clammy after waking up
- The fabric noticeably wicks away sweat and moisture
- Silky, soft feel
Contra
- Only comes in a «regular» fit, not a «body-hugging» version
Martin Jungfer
Head of Content
Martin.Jungfer@digitecgalaxus.chJournalist since 1997. Stopovers in Franconia (or the Franken region), Lake Constance, Obwalden, Nidwalden and Zurich. Father since 2014. Expert in editorial organisation and motivation. Focus on sustainability, home office tools, beautiful things for the home, creative toys and sports equipment.
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