It's an aero thing. Most of the Astana team come from a very small village in Afganrugistan. Consequently they are horribly inbred, with strange lumpy faces and huge tufts of nasal hair on the outside. Obviously these nasal hair tufts attract flies as well as offering rivals an ideal opportunity for 'punishment tugs' which are very painful and can result in a rider losing almost his entire face. To get round this the entire team had their tufts shaved off. The sticky plaster strip covers the scar tissue. In fact, such is the loyalty to the team that when Andreas Kloden rode for them, despite not being an Afganrugistan native (and lacking the external nose tuft) he had a tuft specially grafted on before having it ceremonially removed with a mixture of Veet, foot powder and goat dung. During the 2009 Tour Johan Bruyneel had a secret cache of these nose tufts with which he planned to work wicked voodoo on Alberto Contador but Bertie defeated his evil wizardry by riding really fast. Apparently half the field still fear that Bruyneel can turn them into goat zombies, which is why they are all riding away from Scary Scarecrow Lance really, really quickly.