If you don't know how great these head collars are, below is the description directly from the manufacturer and any further details can be found on the Monty Roberts 

Monty Roberts patented his Dually Halter after designing a way to make it easier for horse, handler and halter to work in partnership. Your horse will teach himself to come off the gentle pressure of the soft, round nose band on the halter when asked, both forward and back. Horses find the halter’s comfortable sweet spot and move with you to maintain it, without pain, knots or poll pressure. The Dually Halter comes with a DVD, booklet, and was originally patented by Monty as dual purpose equipment for leading and horse-healthy lunging or long-lining. Horse trainers have found this halter is a gift in many ways to help train trailer loading, standing still and as a bit-less bridle for riding in tack.

The halter is designed with an adjustable double noseband and left and right side training rings for horse training in Monty’s natural horsemanship Join-Up® way. It has three points of adjustment making halter sizing precise. Monty’s halter has five sizes for a wide range including the mini horse, yearling, pony, Arab, mustangs, cob, warmblood and draft horse. The halter suits most horses for starting the young horse and riding, especially if they haven't been going well in bits. The halter can also be used as a normal headcollar for tying up when using the fixed ring at the bottom under the chin only, but should never be turned out with the halter on.

Introducing the Monty Roberts Dually Halter/Headcollar in full size black. This high-quality equestrian accessory is perfect for any horse owner looking for a reliable and comfortable headcollar. Made from durable nylon material, this headcollar is designed to withstand the rigours of daily use and ensure your horse's comfort during rides.

The Monty Roberts Dually Halter/Headcollar features a sleek and stylish design that is perfect for any horse riding enthusiast. The headcollar is easy to fit and adjust, ensuring a secure and comfortable fit for your horse. Whether you're out for a leisurely ride or competing in a high-stakes event, this headcollar is the perfect accessory to complete your horse's riding gear.