Nike is well-known for running small, especially in their shoes. Unless you have thin feet, you should almost probably get a size up. Those with especially large feet may need to go up one and a half sizes.
The only real way to know that you're getting a good fit at Nike is by trying on several pairs of shoes before deciding which ones feel the best on your feet. There are three things that affect how comfortable a shoe feels: the type of material used to make the shoe, its size, and its fit. A shoe made from leather or synthetic materials will be more comfortable than one made from paper or cloth because your foot will have more room to breathe. The larger the size of your shoe, the more room there is for your foot to expand into. And finally, a well-fitting shoe will feel comfortable right out of the box, while an ill-fitting shoe may cause pain and discomfort as you walk around.
According to Nike, men's sizes range from 7 to 13, with the average being 10.5. Women's sizes range from 5 to 13, with the average being 9. So if you're an 8.5 man (which is what I am), you'll likely fit into a 9 women's pair of sneakers.
Nike sneakers are notorious for running small. Most consumers who have purchased Nike sneakers in the past usually order a size larger. If you have broad feet, you should obtain a pair that is one and a half sizes larger. Nike also offers several styles that run true to size and very few models that run large.
The reason why Nike products tend to run small is because their focus is on design and quality, not price. They know that many customers will buy used shoes from retailers like ebay or Amazon and still want them to look good so they make them available in smaller sizes than most other brands.
However, this does not mean that you cannot get a good fit with a pair of Nike shoes if you order a size larger than your normal shoe size. Just make sure you get an arch support where needed.
Nike, in my opinion, is a traditionally slim sneaker. I have a flat and wide foot, and I used to have problems with their soccer cleats being too thin when I was a youngster. The freeways are a little tiny, but they're doable. I wouldn't suggest Nike if you do a lot of jogging on a daily basis. They tend to be a little thin for that type of activity.
Nike runs very narrow. My typical width is 10 inches from front to back (25.4 centimeters), but some styles can go as narrow as 8 inches (20.3 centimeters). A size 9 would fit me perfectly. I could not get my feet inside a size 8 model. You should also know that most sizes are one piece with a rubber sole. There is no material between your foot and the shoe body like some other brands do.
If you have thick ankles or want more support, you might want to check out another brand.
Many buyers stated that the shoes fit true to size to their "regular" shoe size; many customers stated that they knew from past purchases or reading Amazon reviews that Nikes do run smaller than ordinary running shoes. One customer wrote that her 9-year-old daughter's size 13 sneakers were too small but that it was okay because Nike sizes tend to be smaller than other brands.
Some buyers reported finding the shoes too small but this did not appear to be common. One reviewer wrote that his son's size 12.5 basketball shoes were too small but that he could wear them until they stretched out a bit. Another reviewer said that his son's size 13 basketball shoes were too small but that after two months they seemed to have stretched out enough for him to keep them.
One reader commented that his son's size 13 sneakers were too small but after three weeks of wearing them they had stretched out enough for him to keep them. Another reader commented that his son's size 11 sneakers were too small but after several days of wearing them they had stretched out enough for him to keep them.
One reader commented that his 8-year-old son's size 10 basketball shoes were too small but after four months of use they had stretched out enough for him to keep them.
Nike often runs a size small. These are perfect for my kid!
Some prominent soccer brands' cleats may run smaller or bigger than usual. (As a general rule, Nike shoes are believed to run small, whereas Adidas shoes are more typically true to size or even slightly big, but as with any generalization, you must determine which cleat type best suits you.) Indoor soccer balls tend to be smaller than outdoor balls, so it is easy for players to get away with wearing shoes that are too small.
The most common complaint about adidas indoor soccer shoes is that they run small, especially if you have larger feet like many professional players. You should probably order half a size larger than your normal shoe size. This will help prevent problems later on when the ball hits the floor.
Another common problem with adidas indoor soccer shoes is that their upper leather can break down after years of use. The solution here is to buy some sturdy socks and change out the laces every other game or so. This will help avoid having your shoes lose their fit over time.
Finally, make sure that you get around to cleaning your shoes before you wear them in a match. This is particularly important if you plan on playing in multiple games within a short period of time. The dirtier your shoes are, the less power you will have under the ball.