For Insta360 X4 Air PULUZ Rotation Optical Glass Lens Guard Protective Cover (Transparent) 1. Material: This lens protector is made of optical tempered glass and features advanced coating technologies, including anti-reflective (AR), anti-fog, and hydrophobic layers. It also undergoes an additional hardening process, achieving a surface hardness of 9Ha??approximately ten times harder than standard plastic protectors (typically around 1H). Highly durable and scratch-resistant, it ensures long-lasting clarity and protection. Its native light transmittance is about 95%, and the AR coating boosts it to over 98%, delivering crisp and realistic image quality. 2. Anti-Fog & Waterproof Protection: The hydrophobic coating provides a water contact angle of up to 115 degree, preventing water droplets from sticking to the lens surface. The anti-fog treatment ensures clear visuals in both cold outdoor environments and humid indoor conditions. 3. Deformation-Resistant & Heat-Resistant: It maintains stable performance even in high-temperature environments, resisting deformation or damage to ensure reliable all-weather use. 4. Installation: Designed with a user-friendly twist-lock mechanism, it allows for quick, tool-free installation and removal. You can easily mount or detach the lens protector in seconds, saving time and letting you stay focused on shooting. 5. Portability: The lens protector itself weighs only 4.2g, and 45g with packaging. Compact and lightweight, it fits easily in your pocket or camera bag, providing convenient on-the-go protection without adding bulk.