The Felt mouse is a concept product designed by Joey Roth (and it's going to stay that way only). Working on a PC for more than couple of hours with the rectangular-box shaped mouse doesn't sound too comfortable to me, but the designed thinks that the mouse softness and plyability makes the mouse comfortable without looking cartoonishly ergonomic. As you can see there's no scroll button, so again it's gonna cause considerable problems.

Source [Via Yanko Design]