ALPINESTARS SMX1-R V2 Boots - Black/Red - US 6.5 / EU 40 2224021-13-40 Replacement Boot Soles — Tech 7 Nucleon Flex Pro armor delivers

Nucleon Flex Pro armor delivers optimal protection against impacts

decreases operating temperatures

Single-piece TPU panel with honeycomb sculpturing for maximum grip contact with bike and improved heat and abrasion resistance on the medial facing area

Features advanced acoustical tuning technologies for deep rumbling sounds 4" round muffler front expands to 4

ALPINESTARS SMX1-R V2 Boots - Black/Red - US 6.5 / EU 40 2224021-13-40 Replacement Boot Soles — Tech 7 Nucleon Flex Pro armor deliversThe main upper material is microfiber Tongue and rear accordion made by lightweight padded material that offer superior comfort Airflow and ventilation are improved thanks to lateral Air Intake with metallic mesh New speed lace system derived from Alpinestars MotoGP technology for improved quick precise and secure closure Higher closure system with new adjustable hook and loop closure and debossed Alpinestars logo Foam backed double density ankles