Exterior Design Classic Jet Style: Inspired by the helmets of pilots in the mid-20th century, it adopts a streamlined frame and angular lens design, perfectly reproducing the retro aesthetics. Multi-coloured lenses: Clear, teal, smoky grey, yellow and gradient coated lenses are available to suit different lighting conditions, combining practicality and individuality. Metal decorative details: the frame edges are inlaid with matte metal rims, with adjustable leather straps, highlighting the hardcore retro style. Materials and CraftsmanshipHigh-strength PC lenses: made of impact-resistant polycarbonate, passed the EU CE safety certification, effectively resisting flying stones and impacts, guaranteeing cycling safety. Anti-fog coating technology: The inner and outer layers of the lenses are covered with anti-fog coating, together with the design of ventilation holes, to ensure a clear and fog-free view when riding at high speed. UV400 protection: the lenses can block 99% of ultraviolet rays and reduce glare irritation, suitable for long time outdoor riding. Functional Features Quick release lens system: support one key to remove the lens, easy to clean or replace different colour lenses, adapt to day and night riding scenarios. Ventilation and air permeability design: the two sides of the frame are set up with deflector slots, combined with the helmet vents, forming air circulation and reducing the feeling of stuffiness. Anti-scratch and wear-resistant treatment: The surface of the lens is hardened, which increases the scratch-resistant performance by 3 times and prolongs the service life. Adaptability and Comfort Universal Clip: Adaptable to mainstream retro half helmets, 3/4 helmets and full helmets, with wide compatibility. Adjustable straps: elastic fabric straps with Velcro fastening, freely adjustable according to head circumference. Lightweight design: the frame weight is only 120g, which reduces the burden on the neck when wearing for a long time.