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Tech Profile: The next-gen Weather Shirt

It’s cold, it’s dark and a biting breeze is blowing. But you’re determined to get the miles in anyway. If you can relate, we made the new Weather Shirt for you. Discover the details that make it unique.


Winter miles don’t count double. But they probably should. Keeping your training volume high when the temperature drops is no mean feat. On a dark winter’s morning it takes energy just to get out of bed, never mind out the door. And only then does the real work begin. 



But it’s always worth it. Put in the effort in winter and you’ll run into the warmer months in top form. If you’re a competitive runner, training while others enjoying an off season gives you the edge when things heat up. And if you want to put down a P.R. at a spring marathon, resting through the colder months is not really an option. 


That’s where the re-engineered Weather Shirt comes in. Our updated winter running top is Swiss engineered specifically to balance warmth with breathability. This means there’s no more head-scratching hesitation in front of the wardrobe deciding what to wear against the elements and the importance of this is not to be underestimated – it’s during those pauses that the bed or couch seem obtain the gravitational pull of a black hole. Instead, it’s Weather Shirt on, and out the door. 



Lightweight meets warm

The Weather Shirt is engineered to provide breathable warmth while staying as light as possible. This is possible because the warmth you feel comes not from heavy fibers, but air. Let’s explain…



The Weather Shirt is made of a technical blend that combines soft-touch lyocell and performance polyester in a special channel construction. These lightweight layers are engineered to trap air where it is warmed by your body heat, forming an insulating layer of protection against the cold. 



To ensure you don’t overheat when you pick up the pace, the fabric blend is breathable, wicking sweat away from the body as water vapor. This to keeps you feeling drier and warmer for longer, keeping out the chill that comes from wearing damp gear in a cold climate. 



Chill. Out. 


While the technical fabrics handle the temperature, clever features further also keep out the cold. Jack Frost is highly skilled in exploiting any chink in a runner’s armor. As such, the new Weather Shirt is made to keep you correctly covered (sorry Jack). 


The thumbhole cuffs ensure your sleeves stay where they should be and double as a kind of fingerless mitt for additional warmth over the hand. There's no more rolling up your sleeves to check your pace on a low-temperature tempo run either – both sleeves feature a watch window means to keep smartwatch stats on show while keeping the chill out – whichever arm you wear your watch on. For other on-the run essentials like keys and coins, the hidden zippered side seam pocket is the perfect place. And with cold weather coinciding with shorter days, reflective detailing at the elbows provides extra visibility after dark.




Tailored warmth for women

Science tells us women feel the cold differently to men. And the developers in the On Lab listen to science. 


“Research showed us that women lose a lot of body heat from the chest area compared with men,” explains Sarah King, On’s Apparel Development Lead. 


“With this insight, we added a wool-blend panel to the women’s Weather Shirt, providing women with the additional insulation they need over the front of the body to stay extra warm.


“There are other additional features unique to the women’s version too. Its longer back ensures the lower body stays warm on colder days. While the men’s version has the classic zip collar, the collar on the women’s edition can be rolled down or stood up and fixed in place with a drawcord for extra snug warmth around the neck.” 



Layer up


While it’s warm and wicking enough to be worn on its own, the Weather Shirt combines perfectly with our Performance Long-T or Performance-T


The Performance Long-T is made in a super light Japanese knit fabric that’s quick-drying and breathable. It also possesses anti-odor properties so you stay fresher for longer. All the seams are also carefully placed so as to avoid any restriction or irritation. When things start to get a little warmer, like on an early-morning run in spring or autumn, the Performance-T is a great option as a first layer,  possessing the same properties and performance as the Performance Long-T in a short-sleeved style. 


Whichever combination you choose, you have a winning combination for winter training. With its combination of technical fabrics and smart features, Swiss engineering makes the Weather Shirt your go-to to get out there when others wouldn’t. 


The new Weather Shirt
The technical long-sleeve top for high performance and comfort in cold conditions.
See the details