1. The air hole design is equipped with vents to let the air circulate inside the glasses and prevent the generation of water vapor. 2. It conforms to most dog faces, can be bent moderately, and has strong toughness. 3. The traction rope is carefully woven with eight-strand nylon, which is more powerful and durable 4. Full head circumference: 34cm-46cm (unstretched adjustable range) 5. Lower jaw: 15cm-23cm (unstretched adjustable range) 6. Product net weight: 40g
