JANOSKI STYLE. TOTAL CONTROL. A vulcanized construction gives the Nike SB Stefan Janoski a flexible, broken-in feel. Durable material up top and skate-specific tread on bottom help give you the control and boardfeel you need to learn new tricks and develop your own style. Durable upper breaks in easily and helps prevent blowouts. Vulcanized construction uses heat to fuse the outsole to the upper, giving you a flexible, broken-in feel right out of the box. Flat rubber outsole helps provide grip and durable traction. Product. Leather or fabric in the upper depending on colorway.