An orthotic or prosthetic spacer element including a ventilated and compressible core having first and second opposed surfaces, and a discrete and continuous web-like silicone-based frictional layer secured to the core first surface. The frictional layer and the core first surface have a plurality of coinciding apertures formed in a pattern. The spacer element may include a foam layer secured to the core second surface such that the foam layer and the core have different rigidities. A layer of hook-receivable material may be directly or indirectly secured to the second core surface.