Fenwick Equestrian Liquid Titanium Therapeutic Horse Mask, the first "drug-free", lightweight, breathable therapeutic mask. Referred to in the standardbred industry as the "Potter hood", this fabric helps your horse focus and relax.The use of this high performance fabric in a head or ear covering has produced a calming effect on many horses, nicknaming it the "Happy Hat". Liquid Titanium produces Negative Ions which have been proven to make us feel better by providing us with more energy and a positive mood. This therapeutic fabric is specially formulated to allow the continuous washing and drying of the product without diluting the qualities. This performance fabric functions equally as well on a wet horse as a dry horse. Also, there is no limit to the length of time one can leave the mask on the horse. During the testing stage of this product, the mask was successfully left on horses overnight with excellent results. It does appear that the younger the horse the quicker it works. Some horses have gotten better and no longer require the mask and others seem to do better wearing it 24/7. This fabric has a good bit of stretch so it will snuggly fit. These products should fit like fitted athletic clothing. We carry all the Liquid Titanium Therapeutic Horse Products, so be sure to search our site. From blankets, masks, neck covers, quarter sheets, coolers, leg wraps and knee boots and more. Sizes: x-small (ponies & sm arabians), small (yearlings, sm thoroughbreds, morgans & arabians), mediium (fillies, refined quarter horses, sm thoroughbreds), large (older thoroughbreds, standardbreds), xlarge (large warmbloods) Colors: Dark Grey (all sizes), Black (medium, large only), White (medium, large only)