TRADESMAN PRO KNEE PADS TM Based on feedback and field research with trades people, Klein designed these KNEE PADS to work as hard as you do! They’re built tough, yet comfortable, and feature 5 layers of protection with a stabilizing, non-slip flat outer surface, and a single strap that won’t bunch behind your knee. 5 LAYERS OF PROTECTION 1. Neoprene inner comfort fabric 2. Oversized impact-absorbing gel 3. Molded polyurethane foam 4. Super tough 600d outer fabric 5.