XSmall is 1/2" wide and fits neck sizes from 8-11".
Small is 1/2" wide and fits neck sizes from 10-13".
Medium is 3/4" wide and fits neck sizes from 13-17".
Large is 3/4" wide and fits neck sizes from 17-21"
Matching leashes are 4 feet long and plain and
1/2" or 3/4" wide.
