If youre a cyclist who measures your performance in hours on the bike then this is exactly your sort of road bike shoe rigid and powerful but also comfortable and light in fact weve designed everything about the ksyrium ultimate with endurance rides in mind the entire range features our endofit tongue which surrounds the foot giving you what we call the glove effect this glove also means the tongue cant move around in the shoe so it wont slide sideways during a ride endurance spec