The 2007 Official Sideline Coaches Cap from Nike is made of Acrylic/Wool Blend materials and also features a Dri-FIT Swoosh-flex headband. It is an adjustable hat. This team color cap features alternate team color Sphere Mesh inserts on the crown and bill. Details include authentic interior sideline seam taping and rear Sphere Mesh taping, designating this as Official Sideline issue. Nike Team Sports headwear is engineered to the exact specification of championship athletes.