Superfeet Hike Support insoles stabilize your feet on uneven ground, reducing stress on feet, ankles, knees, and back. Upgrade the comfort of your boots and shoes with dual-layer cushioning foam and structured support made with strong yet lightweight carbon fiber. Help keep your feet secure, even on the steepest climbs and toughest descents. Made to replace the removable liner in roomy to moderate-fitting hiking boots and outdoor footwear. Trim to fit your shoe size.