Change your hard shell at least every second season.
Check if your existing white upper cuff can make little lateral movements.
how to choose your correct size? pls stand up, put your naked heel against a wall and measure from the wall to the tip of your big toe - if the length of your foot is e.g. 26,4 cm please choose size 27,5 cm .
If the hard shell is bigger - that´s no problem, if too short then it`s no good!