L = Adult, S = Child. Ultra-Wide Field of View: The 180-degree panoramic lens provides a crystal-clear underwater view, making your swimming experience safer and more enjoyable. Anti-Fog Coating: A specialized coating enhances anti-fog performance by 40%, ensuring you maintain a clear field of vision throughout your entire swim. Comfortable Fit: The soft silicone material conforms to a wide variety of face shapes combined with an adjustable strap, it ensures a secure, leak-proof fit with zero discomfort. Premium Materials: Crafted from sturdy, durable, and shatter-resistant silicone, making it suitable for use by adults and teenagers. Stylish Design: Featuring a sleek, streamlined aesthetic suitable for both men and women-perfect for everyone from casual swimmers to competitive athletes. Usage Tip: Please tighten the strap and press the lenses firmly against your eyes to prevent water leakage. Weight: 0.57 lbs.