"Synthetic sole" refers to the bottom part of a shoe that is made from man-made materials instead of natural ones like leather or rubber. Full definition
What's more: its textured, synthetic sole provides stability and comfort over uneven ground, and the shoe's design eliminates odor and sweat. (geekwrapped.com)
textile upper textile lining synthetic sole reinforced heel TOMS logo on heel and side One for One (kelkoo.co.uk)
These two - part, closed back sandals boast durable synthetic soles to keep you firmly on your feet. (kelkoo.co.uk)