These 3 Ski Boot Liners Completely Change Your Skiing! Today we’re taking a look at three of our most popular ski boot liners: Intuition Liners , ZipFit with omnifit mouldable cork, and the classic Sidas, your foot company foam injection liners. Each option offers something unique, depending on your skiing style, comfort preferences, and performance goals. Upgrading your liner can be one of the most effective improvements you make to your ski boots, enhancing fit, comfort, and control on snow. Y