The Nike Sport band is the signature band which ships with Apple Watch NikeSeries 2 and later. It is made from fluoroelastomer, however it has compression-moulded perforations for breathability. The perforations often have a contrasting colour in them.
Similar in fit and wear to the normal sport loop, the Nike sport loop bands contain a reflective thread which shimmers when light strikes it. Although both Nike bands are designed to complement the Nike Apple Watch, they can also be purchased separately.