|The SMB-3 is a hybrid between the two best selling protective boots: the original SMB2 and the VenTECH SMB Elite and the UltraShock lining safeguards the cannon bone, tendons and soft tissue, while absorbing energy from hoof impact. Please be aware that the small size of these value packs come with two small boot and two medium boots. The medium size comes with four medium boots and the large size with four large boots. This is how the pack is put together by the supplier and cannot be changed. Value pack of 4.