Sizes 7, 8, 9, and 10 are on backorder and will ship December 19th. All other sizes are in stock and will ship in 1-2 business days as per usual. The Solution Boot Liner - The Ultimate Upgrade Built for support and responsiveness. The Solution Boot Liner transforms tired boots into high-performance comfort machines. Designed for replacing your stock liner in your snowboarding and, skiing, boots, it eliminates pressure points, improves posture, and provides full arch and impact support for stability and energy return. When your boots demand more, this is the answer.Keywords: snowboard boot liner, skiing boot liner, support, arch support, impact absorption, standing all day comfort.