Winter boots are they worth getting??

I need some new shoes or boots, how do people manage to get the sizes right while ordering online. I am a size 9 but sometimes need a 8.5 or 9.5. I worry about ordering online and them not fitting. Any suggestions?
 
I need some new shoes or boots, how do people manage to get the sizes right while ordering online. I am a size 9 but sometimes need a 8.5 or 9.5. I worry about ordering online and them not fitting. Any suggestions?

If it is a shoe I haven’t bought before I never buy on line. Just like you size can vary even within manufacturers. I had to go up a half size in the Nike Vapour Storm boots over what I am normally in a Nike

Similar with adidas. I need a half size up in adiCross compared to Boost
 
They go well with elasticated bottomed trousers, bit like Rickie Fowler, or plsu fours too, as you only have to wash the socks every round ;-)
 
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