Nike. Nike is pretty well-known for running small, particularly their shoes. Unless you have narrow feet, you will almost certainly want to order a size larger. Those with particularly wide feet may need to go up 1 ½ sizes.

Are Nike's true to size?

Despite being notorious for running small, Nike shoes actually run true-to-size across the board. Its sizing may differ from specific brands but overall, its scheme is quite close to the average.

Does Nike half size?

Of many things that make the process of buying a running shoe tricky, footwear sizing has its special place. There are four different types of sizing – US, UK, EU and CM. ... And here is where it gets complicated; for smaller sizes such as US 6 and US 6.5, Nike applies a half-size conversion.