Alpinestars Roam 2 Air Boots - 11.5 US / 46 Euro/Black Technical synthetic material primary upper construction, incorporating a durable perforated microfiber mesh front accordion flex zone with an extended flex area on the back for enhanced Achilles-calf coverage. New boot shaping offers greater comfort and integrates ergonomic toe box construction for enhanced compatibility with bikes controls. Internal heel counter and toe box give boot elevated structural integrity. The Ankle and Toe Box lining constructed in 3D mesh for more breathability. The Collar lining constructed of textile in order to guarantee additional comfort.