Flexi gives the maximum freedom for dogs and much more convenience for their owner´s whilst out on walkies. Freedom for your dog, yet complete control for you. A return spring will always keep the cord taut with never a slack or tangled line whilst your dog is playing around and having fun.Cord or all webbing (depending on the type of leash) retracts and runs out, - gently - as though on ball bearings. The dog feels itself to be completely free, but at any moment the dog owner can stop the dog with slight thumb pressure. The user-friendly construction guarantees a convenient one handed operation. This means perfect control of the dog at any time.