If you like a running shoe – or any shoe for that matter – but you find out that the shoe does not fit you well as it ought to, the logical choice is for you to either get the next half or full size that succeeds or precedes it. One of the most profound aspects of purchasing decision is being able to wear running shoes that are comfortable and snug. But if a half-size option is not readily available, you may have to try that first as it usually opens up the in-shoe experience slightly. If the half-size is still too tight for you, then you need to set your sights on the next size above your initial or preliminary choice which may open up the in-shoe fit. If the half-size version is somewhat too loose for you, then size down from your first selection.