Adizero Adios Pro Evo 3 vs Adizero Prime X 2

The Adizero Adios Pro Evo 3 is a running shoe with one job: get you to a marathon finish line faster than anything else you own. At 99g it is barely there on your foot, and that sub-100g weight is the whole point. adidas has stripped away everything that does not make you quicker, then leaned on a firm ENERGYRIM perimeter to hold the shape and snap the shoe through toe-off. The result is a pure marathon shoe that feels less like footwear and more like a piece of race kit. It sits at the very top of the market on price, and it is not built to soak up your training miles. We rate it as a specialist race-day tool for runners chasing a personal best who already know their legs can handle a light, aggressive ride. If that is you, few road racing shoes feel this fast. If it is not, the Vaporfly 4 or adidas own Adios Pro 4 give you most of the speed with far more shoe underfoot.

With 50mm under the heel, the Adizero Prime X 2 sits a full 10mm over the World Athletics limit for road racing, so no record or championship result run in it will stand. adidas built it that way on purpose, as a carbon-plated experiment in how far stack can go, and most reviewers ended up treating it as a very expensive super trainer rather than a racer. The softness won nearly all of them over. The weight was a different story: it put on a lot over the first Prime X, and several testers struggled to hold faster paces in it. Lab testing and two of the reviews rate it well for long runs and marathon-pace sessions, while one US panel called it a step backwards and preferred version 1. Coach's UK review lands in the middle, calling it great fun but priced above legal racers that do the job better. If you want an adidas marathon shoe for race day, the Adios Pro 5 is lighter, cheaper and legal. We'd buy the Prime X 2 for how it feels on long miles, and only once the price has dropped.