12mm old mac''s multi purpose & Easyboot Trail comfort pads are ideal for horses with foot problems such as laminitis, very flat or thin soles & newly transitioning barefoot horses. Comfort pads helps to condition & improve the digital cushion & should be used with any hoof boot when working to improve the internal & external structures of the hoof. The easycare old macs comfort pads are also useful for lifting the hoof up in the boot if the top edge is too close to the hairline. These hoof comfort pads are calibrated to fit the G2, but work just as well in the original G1 old mac.