Sizes do vary from manufacturer to manufacturer but if you call and ask
for advice the boxing supplier will normally give you a rough guide.
There are many different places to buy boxing boots and gain advice but if you get stuck Boxing Equipment:Boxing Gloves:Boxing Boots:Boxing Store,Clothing,gear,punchbags,headguards,medicine balls,adidas,lonsdale
have always been friendly and ready to help. They have excellent ranges of bbe boxing and lonsdale just to name a few but as i say there are many places to go just look on the internet under boxing boots.