Equestrian Nylon Pony Head Collar in Hunter Green by Horseware. The FieldSafe Head Collar helps to considerably reduce the risk of injury from becoming caught up in horse play, fences, stables, water troughs, trees and branches. Designed to release at a given pressure and is supplied with two safety release straps. One has strength on average of 40kg and the other 80kg. You can assess the risk and choose the level relevant to each situation.