Of the many times that I climbed Shasta in the spring, over twenty of those times I was wearing Asolo Snowfield Cross-Country ski boots. Since they are for winter skiers, they are fairly thick and waterproofed mid-high boots. They flex a little like a hiking boot, and they have a standard vibram sole for tread. The only trick is that it has a 3-pin nordic toe, so you have to make sure that your crampons fit. Then high-top gaiters will keep your boots warmer and dryer.