SoundHorse EquiFlex X-Soft 3lb, it's a premium two-part silicone hoof packing (dental impression material) designed for maximum cushioning, shock absorption, and sole/frog support. The X-Soft version has a Shore A durometer of approximately 25.

Key Features:
Gas-permeable silicone allows additives such as copper sulfate to migrate through the cured material.
1:1 mixing ratio for easy application.
Quick-setting formula designed specifically for hoof packing under pads.
Maintains cushioning throughout the shoeing cycle and across varying temperatures.
Available in 3 lb kits containing two 1.5 lb components.

Best Uses:
Thin-soled horses
Horses needing frog support
Horses working on hard surfaces
Cases where shock absorption is desired under pads
Horses prone to sole sensitivity or concussion-related discomfort