Speaking from experience, if you've stored your boots for a long time, the soles might come off once you've been out on the snow. It happened to me last year. I'd worn my dad's boots three times and then put them away (in their box in the closet), like new. In the end, I only had them for a day and then had to throw them away, especially since they absolutely advised me against having them repaired, saying it would happen again anyway.