They have had some use. In practice, on-board profiles DO NOT include color/lighting schemes. Look good and comfortable. I wear a medium and purchased a LG. On the plus side, it is very cute. Ive seen people use cheap plastic versions of theses that have broken very quickly or are too loose it makes them unusable. UGG is the best and I own several pair of their sandals and boots. I bought it for under my desk bridge to shine light on my desk area. According the the Logitech website, its 21. I have the same exact pair in black & they fit perfectly.