Sealing silicone ring: These mermaid swimming goggles are designed to fit the child's eye shape, with a sealing silicone ring that prevents water ingress. They are tight but comfortable to wear. Eye health: These mermaid swimming goggles are specially designed for children who to explore the world safely underwater. They eye health from chlorine and salt water. Freely adjustable mirror strap: The mirror strap can be easily adjusted to fit the tightness of your child's head, making the goggles comfortable and secure. Gentle on skin: Made of soft and durable silicone, these mermaid swimming goggles won't scratch your child's skin or cause irritation. They are also reusable and easy to clean. Clear vision: With these mermaid swimming goggles, you can enjoy the underwater world at a glance. The anti-fog lenses prevent water from affecting your vision, giving you a clear and transparent view of the aquatic scenery.