My ski boots fit extremely snug, but after a little packing out of the liners (totally normal and expected), I do get a little wiggle room on the top of my toes. Since there's so much static force with the foot pushing forward and up when on skis, when the liners pack out, it causes a little toe discomfort (toe bang) because of the new movement created. I would think something like Powerfoot would "restore" the liners somewhat in that area and also add additional cushioning, and at $20, they would be a whole heck of a lot cheaper than replacing the liner.