According to Eurosport he had to retire due to abrasion on the skin, especially on the hands. Contador went ballistic on Eurosport criticizing the riders that do that. They don't understand why they do it since now technology allows them to pick any type of gloves. He went further to say, imagine that one of the main riders had to retire from a GT because they are not using the gloves. That is unforgivable.
Can anybody here tell me why riders don't use gloves other than for esthetics, which is what Contador and Flecha were alluding as the main reason for not wearing them?
Some people say it's an aerodynamic advantage to ride without gloves.