The D2 from Troy Lee Designs is a high-quality inner padding for bicycle helmets, specifically designed for comfort and safety. This accessory is made from 100% polyester and provides a comfortable fit for various head sizes, particularly for sizes M to L, ranging from 57 cm to 62 cm. The black color not only offers an appealing look but also easily complements different helmet designs. The use of textile material ensures a breathable and durable surface, enhancing comfort during rides. The inner padding is an essential element for prolonging the helmet's lifespan while optimizing protection. It is easy to install and clean, making it a practical choice for cyclists who value safety and comfort. The D2 headliner is therefore a sensible addition to any bicycle helmet and contributes to an improved riding experience.