Even if it has been a few weeks since your last ski, water can still be trapped inside your ski boots. To help ensure they are completely dried out before storing them, you can do the following. Make sure you have released all of the buckles on the boot so that it is loose in structure.  Now you can remove the inner linings and inner shell. Allow these parts to air dry for a couple of days, making sure they are thoroughly dry. You can place them in front of a fan to speed up the process but tumble-drying is not recommended. Once dry, you can re-insert the linings and shell and then store the boots in a cool and dry place, as mentioned above.\r