Invenho Arnés de malla con chaleco acolchado para cachorros y gatos, diseño sin asfixia, regalo de ventilación con una correa y cinturón de seguridadMedium Size Specifications: Chest Girth: 17. 5 21. 5 inches; Neck Size: 11 inches; Nylon Strap Length: 47. 3inches; Seat belt Length: 27. 8 inches Beware of The Size Chart : The "neck size" is the actual size of the opening. This is the same opening through which the head must pass. Made with High quality breathable mesh material to keep your loving pet nice and cool while keeping you in total control; Clips around both your pets neck and chest