For a bit of context most of my fell running is in the Lake District, and my go to shoe for years has been the classic La Sportiva Mutant. My only issue with these shoes is that during the colder months my feet get absolutely freezing, making winter running extremely uncomfortable. So when I got the chance to try a pair of the new La Sportiva Tempesta GTX I absolutely jumped at the chance! So let’s see how they have squared up over a few hundred frozen winter miles.