KingWinX Adjustable reseau Safety Dog Car Seat Belt Material: Cotton. Size S for dogs weight within 1.5-2.5kg/S: Neck(cm):26, Chest:30-42cm. Size M for dogs weight within 3-6kg/M: Neck(cm):32, Chest:35-50cm. Size L for dogs weight within 5-7.5kg/L: Neck(cm):38, Chest:42-60cm. Package: 1 piece Seat Belt