This muzzle is not only a very good quality but has an exciting look! Its padded mouth piece and collar allow a certain tightness making its efficiency but allow a long term wearing. We experienced it over a day without major problem. The wearer will feel a constant tightness all around his head, a light disconfort but no real pain. The D-rings installed at the collar and the top of the head allow to chain the sub in place or from the ceiling to avoid him sitting down for example. This is an excellent device for speech or food control. Unfortunately it is not lockeable so you cannot leave your sub unatended and hands free.