Seal: Shock absorption and pressure seal。 4Shape: Fit most of , suit for round , oval , slender , melon , square and so . According to the 3D ergonomic design, it fits the eye socket comfortably, and the double-layer sealing silicone . Straps: High flexible straps, adjustable. The sealing is large and dense, the waterproof performance is more obvious, and the protection of children's eyes is better.