First, "fenders" is perfectly correct. Bridges have fendering systems, as do many commercial piers. Around here saying "bumpers" makes you sound like a lubber. But if that's local usage where you are, then when in Rome...
I've found that fenders can cause a boat to bounce, and ruin a perfect docking. Another solution is old fire hose, fastened accordion-style along the outermost edge of the floating dock. You can buy expensive plastic edging, but as WesK points out it can leave marks after a while. Once safely docked, then you can deploy fenders.