I always wanted breathable On shoes and the Cloudflyers proves that this is possible. With breathable mesh materials, the shoes are well constructed for long training sessions. Their stability is impressive as well. With larger Cloudtec pockets on the outsole, they just feel more stable. However, when you take them around the block, you might experience some discomfort in the heel area if you are a heel runner. Apart from this issue, they are lightweight with not too much cushioning but with good lateral support. The heel to toe transition is also not impacted by the unusual outsole as some runners would expect.