Do I have to purchase the sleeves as a pair for both elbows and knees? Is it not possible to buy just one?

Currently, the sleeves are only available as a set, which includes two for elbows and two for knees. This is because we recommend wearing them on both sides to maintain balance between the left and right sides of the body. The set is designed with body symmetry in mind, helping to improve posture and sleeve more effective exercise.