Airgo Comfort-Plus Derby Handle CanePatented Ergo Handle The cushion top ergo handle conforms to your palm and helps reduce impact shock transfer. Only our handles have our patented ergonomic bump. Look for this seal of authenticity to be certain you're holding the original! Flex Grip TM Tip The Flex Grip tip is engineered to provide fluid surface contact throughout the walking motion. Tread design provides superior grip and also helps to absorb impact shock.