The Calf Nelson CUFF keeper keeps your pants clean while making you more visible at night. It's made of durable full grain leather with a spring steel core, just like the slap bracelet you used to wear in the '80s. A double line of reflective stitching around the edges makes you more visible in traffic at night. The Calf Nelson is a great piece of commuter gear that will keep your pants leg clean and look good doing it.