These insoles are designed based on the biomechanics (biology/structure/kinetics) of the human body, with the purpose of maintaining the skeletal structure of the foot and supporting the muscles of the sole. They are especially recommended for children to adults, and the elderly, who have poor balance or gait when standing. Brand: Superfeet Product Name: Trim Blue Size: Pre-cut to 23cm There are no cracks, but there is some soiling from use. Please look at the photos carefully before purchasing. Color: Blue