The Nike Vaporfly 4 is widely regarded by experts and users as a premier road racing shoe, optimized for speed and efficiency from 5K up to the marathon, but with a particular sweet spot at 5K to half marathon distances. Its extremely light weight (5.9 oz), snappy and responsive ZoomX midsole, and carbon plate deliver a propulsive ride ideal for racing and tempo efforts. The firmer, lower stack design compared to previous versions improves stability and ground feel, making it more suitable for faster paces and sharper turns, but reduces cushioning for extended easy miles or slower marathoners. Most reviewers and users find it less comfortable for daily training or recovery due to its firmness, minimal upper, and lower durability. It is not recommended for trail running due to limited traction and stability off-road. For long runs, it can work well for experienced runners or as a marathon racer for those who prefer a firmer, more connected feel, but many experts suggest more cushioned options for slower or less efficient marathoners.