SIZE CHART SIZE 1: Length 1.2 in (3.2cm), Width 1 in (2.7cm), Recommand Weight 1-3 lbs (0.5-1.5kg) SIZE 2: Length 1.4 in (3.8cm), Width 1.1 in (3cm), Recommand Weight 3-6 lbs (1.5-3kg) SIZE 3: Length 1.6 in (4.3cm), Width 1.2 in (3.3cm), Recommand Weight 6-9 lbs (3-4.5kg) SIZE 4: Length 1.8 in (4.8cm), Width 1.4 in (3.7cm), Recommand Weight 9-13 lbs (4.5-6kg) SIZE 5: Length 2.1 in (5.4cm), Width 1.6 in (4.3cm), Recommand Weight 13-16 lbs (6-7.5kg) Material: Rubber sole + Breathable Mesh Cotton. Elastic rubber band and handsome magic band design can easily adjust the tightness. Wipe with water or wash directly, it is convenient to clean. The flexible sole makes the dog more comfortable, with 5 sizes and 4 colors to choose from.