At the age of 9-12 years, children and adolescents sometimes complain about pain in their heels when they are walking or running. These "growing pains" are caused by a softening of the large heel bone (calcaneus) and are often associated with foot deformities. On the one hand, these create high biomechanical stresses on the Achilles tendon, which is attached to the calcaneal bone. On the other hand, the stimulus in the growth plates is asymmetrical, causing pain. Many young people can achieve muscular stabilization in the ankle with the help of a PROPRIO® foot orthosis. At the same time, the foot orthosis relaxes the calf muscles, leading to a reduction in Achilles tendon tension. The distinctive property of the foot orthosis is the special material used to pad the heel area and soften foot strike.