They should be very snug because they will pack out when riding. Your toes should touch the end of the boot while standing up and not touch them when you bend you knees. If your heel lifts it's the wrong boot. Heel lift is the worst. Of course they should be comfortable too but some pairs just take a few days to get comfy.
Make sure you go to a specialized store if you have one around and they will help you find the right pair. Don't buy online without trying them on first.
Last edited by Basti; 02-21-2013 at 05:41 AM.