O: The base is not attached to the middle layer. The middle layer is attached to the top layer. A thermowelding stage is required. The pattern used for the base is wider than for the S versions, enabling the professional to adapt the pattern.
7 sizes: 35/36; 37/38; 39/40; 41/42; 43/44; 45/46; 47/48 (available on demand).
Materials