Extra Small
Fits necks 7"-11"
Fits chest 12"-16"
15mm wide
Weighs 2oz
Small
Fits necks 9.5"-15"
Fits chest 15"-22"
15mm wide
Weighs 2.5oz
Medium
Fits necks 12-20"
Fits chest 20-28"
20mm wide
Weighs 3.6oz
Large
Fits necks 16-26"
Fits chest 24-38"
25mm/1" wide
Weighs 5.7oz