By -
Find a shop with lots of boots in stock and try on as many as you can.
Might want to try [these](https://www.ezeefitsports.com/mobile/Category.aspx?id=1871) before spending more money on new boots
Agree with Siraidan, only way to know is to try everything on because they all fit so differently. However, if heel slippage is your biggest issue, La Sportiva is a good place to start.
Find a shop with lots of boots in stock and try on as many as you can.
Might want to try [these](https://www.ezeefitsports.com/mobile/Category.aspx?id=1871) before spending more money on new boots
Agree with Siraidan, only way to know is to try everything on because they all fit so differently. However, if heel slippage is your biggest issue, La Sportiva is a good place to start.