meterial,polyester

XS-back length:20cm/7.87inch,bust:30cm/11.81 inch,suit for pet weight:0.6-1.2kg

S-back length:25cm/9.84inch,bust:35cm/13.77 inch,suit for pet weight:1.2-2kg

M-back length:30cm/11.81inch,bust:40cm/15.751inch,suit for pet weight:2-3kg

L-back length:35cm/13.77inch,bust:45cm/17.711inch,suit for pet weight:3-4.2kg

XL-back length:40cm/15.74inch,bust:50cm/19.681inch,suit for pet weight:4.2-6kg

2XL-back length:45cm/17.71inch,bust:55cm/21.65inch,suit for pet weight:6-8kg