[ ATHLETIC-FIT ]

>> European sizing: Performance garments run smaller than US sizing <<

We can't state this enough:

All our performance garments are designed and cut to do a specific job >> RUN.

Which is why they will run on the smaller size than what you're likely used to. They are technical garments that hug the torso more, because lots of loose fabric flapping about as you run isn't a good thing. 

If in doubt please refer to size/measurement charts found with each specific product.

But...

In general we do advise to size-up one -- unless you're really after that extra fast AF race day fit.  

Our (World First) \\_un-race sleeves with gel pouches run tight; stretchy and awsm but tight-fitting. So if in doubt, size up. And if you're built like Arnie or The Hulk, realistically you are probably even going to struggle with the size [L]:(  

You'll also find a relevant measurements chart in each product section.