Xs: chest circumference 26-30cm, neck circumference 17-20cm, rope length 150cm, recommended weight 3 kg. S: bust 31-35cm, neck 21-23cm, rope length 150cm, recommended weight 3-5kg. 1. Soft and comfortable fabric breathable and comfortable mesh, polyester material, smooth and not easy to wrinkle/same color mesh soft and comfortable and breathable. 2. In case of light, it will be unsafe to travel, and the multi-directional reflection on the chest and back/night is no longer an obstacle. 3. Anti-free design+comfort is not scrag, specially designed vest version for cats, not scrag, cats are more comfortable to wear. 4. Small size is lighter and less cumbersome without buttons. Note: Small size (XSS) takes better care of small cats without buttons. 5. Innovate anti-lost branding to be a cat with identity, and you can go home with a phone call, giving the lost cat more hope to go home.