The Kentucky D3O Deep Fetlock Young Horse Boots were designed for horses that catch the lower part of the fetlock joint when jumping. Kentucky developed a new fetlock boot with integrated pastern protection. Permitted in the FEI and BSJA young horses classes.

The fetlock boots have an extended neoprene lining that also covers the inside of the pastern area. This gives additional protection to the fetlock and also against cuts caused by the crossing of the hind legs when show jumping.

Like the original Kentucky Young Horse Boots. The D3O intelligent molecules fill the main strike and impact area of the protective horse boots.