These dog collars off high visibility in the field, remain pliable in cold weather, clean up quickly without holding dirt or scent from the field. Center ring option available for easy maneuverability in the field without getting caught up. Length is determined by the middle hole on the 5 hole-punched side, meaning each collar is adjustable 2" up or down from its indicated size (example: 18" collar is adjustable from 16" to 20"). Our standard synthetic collar in 1" width - available sizes from 16" to 24" These collars are made in St. Paul, MN USA