1. Material: PC 2. Strong and durable, not easy to damage 3. Hollow design, strong air permeability 4. Easy to put on and take off, the webbing is not easy to fall off 5. S: Top length is 9 cm, bottom length is 6 cm, mouth circumference is 20 cm, weight is 36 grams 6. M: top length 11.5 cm, bottom length 7.5 cm, mouth circumference 26 cm, weight 53 grams 7. L: Top length is 11.5 cm, bottom length is 7.5 cm, mouth circumference is 30 cm, weight is 62 grams
