The HALTI OptiFit is a premium headcollar designed to provide an Its unique design works by gently directing the dogs head, steering him into desired positions just like a horse. With a self-adjusting chin strap and unique, reflective cheek straps which follow the contours of a dogs face, the OptiFit doesn?t rise into the dogs eyes or slide down to his lips (flews). Designed to fit dogs that other headcollars don?t - from short nosed Boxers to long nosed Greyhounds, the OptiFit provides maximum comfort and optimum fit no matter what shape or size. The pack includes a HALTI OptiFit Headcollar, a comprehensive Training DVD and Guide and a HALTI safety link which connects to the dogs? collar for extra security.