ALPINESTARS SMX-6 V3 Vented Boots - Black - US 8/EU 42 2223225-10-42 Optional Driver's Backrest Assembly for Heated RoadSofa Pillow Top Seat Features a large 4"

Features a large 4"

Adapts fuel injectors to work with Koso intake manifold

360° swivel in two directions

Alpinestars unique ankle brace protection system provides a bio-mechanical support and protection between lateral top calf

Innovative design features “hips” at the outer edge of the shield that re-routes the air to add downforce and aid stability

ALPINESTARS SMX-6 V3 Vented Boots - Black - US 8/EU 42 2223225-10-42 Optional Driver's Backrest Assembly for Heated RoadSofa Pillow Top Seat Features a large 4"Packed with a host of innovative safety and protective features, SMX 6 v3 Vented Boots are the ultimate track and street performance riding boots packed with race derived technology and protective materials designed to give riders a crucial performance edge on the track or street Precision engineered to closely conform to the anatomical contours of the foot, offering optimal flexibility, improved walking comfort, and breathability Every component has