SUPERBLAST has a lot of foam underfoot, so the fit needs to keep your foot settled on the platform. The shoe should feel lively when you move, not loose inside the upper.
GAIT analysis can help check whether the SUPERBLAST 3 suits your stride, especially if you are moving from a lower-stack daily trainer into something with more bounce. The rocker and trampoline pod should feel natural once you start running.
Because SUPERBLAST 3 is a unisex model, sizing deserves a proper check. The team at Smiths can help compare the fit against your current running shoes and make sure the width feels right through the forefoot.
Bring in your current trainers if you have them. The difference between your usual shoe and SUPERBLAST is much easier to judge when you can try them side by side.