ON Cloudflyer 4 is a good choice for a running shoe for the runner who is looking for a shoe with stability. This edition of the Cloudflyer series has an updated, softer tongue. The sole is made a bit harder on the inside, so if you are used to running in a pronation shoe, this might be something for you. It is not a pronation shoe in the classic sense. The shoes have ON's characteristic clouds underfoot, which in combination with ON's midsole material, Helion and ON's Speedboard technology form the bottom of the shoes. The clouds, the Helion material and the Speedboard are made so that the shoes support more on the inside, which gives a more natural foot movement than a classic pronation running shoe. ON is continuously working to make their production more sustainable, and this shoe is made with 35-40% recycled material.