In order to increase the efficiency of insoles or shoe inserts, it is proposed to start from a semi-finished product (100) having a foam material layer which has a plurality of integrally formed raised sections on the upper side. According to the invention, the raised sections (120) or at least one of the raised sections should comprise one central raised section and a raised section completely or partially surrounding said central raised section, thus forming a plurality of massage edges. The probability of stimulating the desired reflex zone is hereby increased.
