Rands: Thin rubber bindings that run around the junction of the upper and sole and part way up the boot. Rands add to a boot's overall waterproofness and protect the upper from abrasion.
Rip-Stop Nylon: A type of nylon fabric with heavy, criss-crossing fibers, which makes the nylon tear-resistant.
Rocker: The curvature of the sole from the heel to the toe of a boot to facilitate walking.
Rope: Long and round nylon fabrication. Climbing ropes are generally between 10 and 11 mm in diameter (with the exception of "half ropes" which are between 8.5 and 9mm in diameter).