Dr. Robert Cook's Bitless Beta Headstalls are made of a synthetic material that combines the strength of nylon with the easy care of vinyl. Beta is particularly popular with trail and endurance riders, since the material requires no maintenance and can be subjected to virtually any conditions without being affected. Beta is a leather-like synthetic composed of a nylon core with a vinyl coating. It is impervious to dirt and sweat, and will give you years of use with no maintenance required. The material stays supple in freezing weather and doesn't dry out or get brittle with age. Beta is durable and easy to clean - just dunk in a bucket of water, swish around and hang to dry. It has a slightly grainy surface and low-sheen surface, which gives it a leather-like appearance. Beta is a little heavier than nylon. Reins sold separately Review the attached PDF file for sizing information.