When it comes to Burton boots, there is no one-size-fits-all answer. While some people find that Burton boots run small, others find them to be true to size or even on the large side. The best way to figure out what size will work best for you is to consult the size chart on Burton's website and/or try on a pair of boots in person before making a purchase.
If you do decide to buy Burton boots online, be sure to read customer reviews carefully. Look for comments about fit and sizing from people with similar foot shapes and sizes as yours. And don't forget to factor in whether you'll be wearing thick socks or not - this can affect how snugly a boot fits.
Finally, remember that you can always return or exchange Burton boots if they don't fit quite right. So if you're unsure about what size to get, it's better to err on the side of caution and go with a larger size rather than risk being stuck with a pair of too-tight boots.