ComfortFlex American Made, Fully Padded Nylon, Adjustable, Flat, Reflective Limited Slip Collars AMERICAN MADE for active dogs FULLY PADDED NYLON CONSTRUCTION featuring highly reflective woven strapping for optimum visibility in low light or night time use. BETTER CONTROL OF YOUR DOG  Limited Slip Collars, also called Martingale collars, give you complete control of your dog by gently applying pressure but not choking your dog as with metal choke chains or other harsh corrective measures. PREVENT YOUR DOG FROM BACKING OUT OF THE COLLAR  When properly adjusted, it is impossible for a dog to slip out of the collar. These collars are great for all small or large dogs, especially for breeds with larger necks than head, such as Greyhounds or Whippets COMFORTFLEX OFFERS 11 VIBRANT COLORS in 4 sizes, Small through X-Large