A 'Halter Heaven' rope halter is designed to sit lightly on your horse's face.  The knots are specifically positioned to sit in grooves or depressions on your horse’s head so they do not exert any undue pressure during training.

 

The areas of the horse halter that exert the most pressure are the nose band and poll strap, so these areas have a double thickness of rope to spread the pressure over a larger area, therefore lessening the pressure per square inch.