Cleatskins are compatible with Time I-CLIC, I-CLIC 2, X-PRESSO, LOOK Keo, Shimano SPD SL, and Speedplay Zero cleats respective to the brand type.  Cleatskins protect your cleats when you are walking around out of the saddle.  They are comfortable, safe (non-slip), and prolong the life of your cleats.  They are easily stored in a seatbag or in the back pocket of your cycling jersey.