Professional glasses, professional fit based on ergonomics, comfortable, humanized design, good choice for swimmers. The unique streamlined smooth and flexible pipeline minimizes water resistance, and the lower end is equipped with a water outlet. Even if water enters, it can be easily discharged from the lower drain. Easy to assemble: Equipped with safe and quick dismantling pipe clips, allowing you to easily install and disassemble the ventilation pipe. Soft silicone nozzle: non-toxic and harmless, it protects your safety and is suitable for long-term use.