Alpinestars SMX-1 R Vented Boots - 12 US / 47 Euro/Black/White Primary upper construction of advanced microfiber for durability, comfort and extreme levels of abrasion resistance. Innovative heel counter support system, works together with strap closing to deliver improved support and fit as well as structural integrity. Rear of heel counter redesigned with soft TPR insert working together with rear flex zone to permit greater freedom of ankle movement and comfort on the bikes controls, plus durable TPR shift pad. Instep and Achilles accordion flex area constructed of featherweight microfiber for optimized levels of durability, comfort and maneuverability on and off the bike. Front Velcro closing system provides a quick and secure fit over the instep zone while allowing excellent levels of flex. Strap highlights TPR puller for effortless use.