KASK Protone road cycling helmet, designed for road riding and racing. It uses KASK’s lightweight in-mould construction with an aerodynamic, well-ventilated shell, an adjustable rear fit dial, and a secure chin strap retention system. The helmet is intended for adult riders and is available in multiple sizes, with a unisex fit. This model is the original Protone road helmet, later succeeded by the Protone Icon.