Intuition Liners are used by some of the best athletes. in the world, including extreme big mountain skiers, national ski/snowboard team members, professional instructors and backcountry tour guides, high altitude mountaineers, and thousands of ski patrollers. These people virtually live in their boots all day, every day, and demand the best performance and comfort possible from their equipment. They also need their boot liners to last longer and be more durable than the stock boot liners provided with their boots, so the only solution is Intuition Liners.