Choosing the right size snowboard boots is important for a comfortable and safe snowboarding experience. Here are some tips from the search results:

• The right size snowboard boot is not always the same as your shoe size. It can be, but it’s not always going to be the case, so you can’t assume that it will be.
• Most riders choose boots half a size or a full size bigger than their street shoes. In any way, your heels should fit tight while at the same time your toes should just feel the front of the boot when putting weight on your heel.
• The fit should be snug, but not uncomfortable. Keep in mind that liners compress ("pack out") with use and will end up roomier at the end of the season than when you bought them, so if you’re deciding between two sizes, it’s best to size down.
• When trying on snowboard boots, wear thin, synthetic snowboard socks and make sure the boots are tightly laced. Flex your legs and make sure you feel comfortable in any kind of position.
• It’s a good idea to try boots on in person if you can, and even if you do try on in person, it’s important to understand the fit that you should be looking for.

Remember that the right fit is key to a comfortable and safe snowboarding experience. If possible, have yourself professionally fit by an REI snowboard boot specialist or other qualified person.