It allows air flow around the nose and limited grazing. Typically grass intake is reduced by between one third and a half. Ponies prone to laminitis or horses in peak fitness can then be turned out for longer without fear of over-eating. It is also used to prevent cribbing or rug-ripping. People who have tried bucket devices in the past are particularly pleased with it.
Horses are more comfortable and slots allow maximum ventilation around nose.
Safety is a key part of the design. The nose band attachment is intended to break if the muzzle becomes caught and will be replaced for free. The Greenguard grazing mask is already proven in Germany, Denmark, Sweden, Holland, Austria, Switzerland and France, where several thousand are being used successfully. The mask has a long life expectancy as it is made of the same material as is used in firemen s helmets. This plastic is of a pliable food-grade, and is unaltered by UV exposure, heat and cold.