Adidas Ultraboost 5X vs Puma Velocity Nitro 4:
Which to Choose

The clearest split is weight and ride character. The Velocity Nitro 4 comes in around 224g (men's US 9), while the Ultraboost 5X sits roughly 50g heavier at about 275g — a gap you feel the moment you try to push the pace. That weight tracks with the two foams: the Ultraboost's TPU Boost is soft, dense and distinctly springy, a plush bounce that most runners notice instantly but that can feel a touch sluggish when you accelerate. The Velocity's nitrogen-infused NITROFOAM is the opposite temperament — lighter, firmer and lively rather than pillowy, firming up pleasantly as you lift the pace and giving a more connected, honest ground feel (which is also why it reads a little firm at very slow jogs, where the Ultraboost is more cradling). That difference shows up in the responsiveness scores (Velocity edges ahead, 4/6 to 3/6) and in usable range: both excel from the 10K through the half, but the Velocity stretches comfortably to the marathon at easy effort and takes tempo work down to roughly 4:40/km, whereas the Ultraboost's sweet spot stays in the 5:30/km-and-slower easy zone. The two are genuinely matched elsewhere — same 10mm drop, same neutral support with no medial post, same plateless build, similar durable-but-warm uppers, and comparable everyday cushioning depth. The last real distinction is fit and feel: the Ultraboost uses a laceless Primeknit sock-like upper and a Continental outsole, so it's a true slip-on, plush-comfort experience, while the Velocity uses a laced engineered knit/mesh upper reinforced with PWRTAPE over a PUMAGRIP outsole for a more dialed-in, adjustable lockdown.