Our fat bike tire liner serves as a protective barrier, reliably protecting your inner tube from thorns, glass, nails, and sharp debris. Designed to be compatible with tires from 20", 24", 26", 27.5", to 29", this universal fit ensures broad application. With a width of 80mm/3.15", it perfectly fits 3"-4" wide tires, including specific size like fat tire liners 20 x 4.0 and fat tire liners 26 x 4.0. Made of high-quality Polyurethane,our fat tire bike tire liners (inner tube flat protectors) feature a lightweight design, excellent wear endurance, and great flexibility, and easy to install，just trim to size and place between tube and tire. Enjoy long lasting fat tire liners tube protection, reduce sudden flats, and riding with confidence.