Originally Posted by Mystery2many
If I'm not mistaken the biggest boot you should use for 253 width is a 9 or 10.
Not even close. Waist width alone doesn't determine max boot size, you also have to take into account the sidecut and edgetech with certain brands. Actual width at the inserts is the best way to determine max boot size. Typically a regular board will support a boot up to size 11 before it starts to get more complicated. Boot choice and design (shrink tech) can also play a roll in deciding between regular and wide when you're at the max size line based on your (actual) foot size.