The nylon strap of the Best Fit Adjustable Mesh Dog Muzzle easily adjusts to fit your dog perfectly. High-quality mesh webbing provides ventilation, while the open front allows for easy panting and breathing. Available in nose circumference sizes 1 (3"), 2 (4"), 3 (5"), 4 (6"), 5 (7"), 6 (8"), 7 (9-1/2"), 7XL (10-1/2"), 8 (11-1/2") and 8XL (13-1/2"). This mesh muzzle provides a safe, comfortable solution whenever temporary muzzling is necessary. Comfortable mesh. Easily adjustable.