ViscoHeel K heel cups are uniquely raised / angled on one side. Correcting alignment from the hip to the ankle by pronating or supinating the ankle. They can be an effective off-loading technique for damaged cartilage (O.A.) of the knee and ankle. The ViscoHeel K wedges provide the same superior cushioning and shock absorbing features of original ViscoSpot heels. These supportive silicone heel wedges are also amazing at reducing shock to the joints and back. The silicone material is also non slip in the shoe. Sold in pairs only.