Brs 1000 carbon rubber delivers the ultimate in durability and traction coupled with an ortholite sockliner for comfort air zoom unit in the heel delivers low profile cushioning and impact protection with flywire for support features nike zoom air unit positioned to the heel provides impact protection on footstrike cushlon foam in the midsole offers soft cushioning through toe off dual layered flywire cables produce a secure fit over the flymesh upper brs 1000 carbon rubber provides