This set is made out of matching yarn.  The beanie hat measures 20" around and stretches to 23".  The length is 8".  The back of the hat can be pulled down for a little slouch effect if needed.  
The scarf is 40" long and 6.25" wide.  There is a unique keyhole opening where one end of the scarf is pulled through the other end (see picture).  This allows the scarf to lay flat under a jacket or coat.
The yarn is acrylic for easy laundering.