Tire Liner — flexible polyurethane composite that protects your inner tube from punctures while conforming to tire pressure without causing damage. Key benefits Reliable puncture protection for mountain, highway, and folding bikes. Stops flats caused by sharp glass, crushed stone, and road debris. Lightweight, lowprofile protection that does not affect ride quality. Designed to be ultrathin so you retain original handling and performance. Universal cuttofit design that adapts to multiple tire sizes and bike types for easy installation and broad compatibility. Features Material: Flexible polyurethane composite that conforms to tire pressure and resists penetration without abrading the inner tube. Puncture Proof Belt: Serves as a durable internal tire pad to prevent damage from everyday road and trail hazards. Tire Pad weight: Ultralight construction adds minimal mass — 64 grams for 700C tires and up to 108 grams for 29' tires. Tire Lining Inner: Can be trimmed to size for a general fit across different tire widths and bike models, including dead fly and commuter bikes. Installation: Designed for easy fitting inside the tire between tire and tube with no measurable impact on riding performance. Typical applications Urban commuting: Place the liner to reduce flats from broken glass and metal debris on city streets. Gravel and mountain riding: Use as an internal shield to prevent punctures from crushed stone and trail debris. Long road rides and touring: Keep extra protection without adding significant weight for sustained performance. Specifications at a glance Function: Internal tire liner / puncture protection pad Material: Flexible polyurethane composite Weight: 64 g (700C) up to 108 g (29') Compatibility: Mountain, highway, folding, commuter, dead fly and other bike models Fit: Cuttofit for various tire sizes What you get A durable, lowprofile tire liner that protects your inner tube, is easy to install, and maintains riding performance across multiple bike types and tire sizes.