3Piece set includes collar, body harness, and leash which are 2cm wide. Leash is adjustable from 90cm-150cm. 

Size (collar) Neck circumference 
  S: 21~30cm
  M: 29~43cm
  L: 40~65cm
  XL: 49-82cm

  Size (Harness) Chest Circumference
  S: 30~41cm
  M: 36~46cm
  L: 46~73cm
  XL: 60-89cm