The phrase "smooth leather" refers to leather that has a very soft and even texture. It does not have any roughness or bumps on its surface. Full definition
Casual lace - up trainer with smooth leather upper. (kelkoo.co.uk)
The small - diameter steering wheel has a thick rim wrapped in smooth leather, and the seats are firm, with plenty of lateral support. (automobilemag.com)
Designed with smooth leather and a covered block heel, this knee - high boot brings streamlined sophistication to any look. (solesociety.com)