This low top hat is made of black felt and is 2 1/4" x 3" wide and 3/4" tall.  The oval head opening is 1 1/2" by 1 1/4".   The band is 1/4" wide black ribbed ribbon.  

The hat will fit most Ken (as shown) dolls and Kevin but it might not fit a Ken or BJD with thin molded hair.  It fell over the eyes of Luke Skywalker and my Ken Arsenio Hall.  It would fit a 12" GI Joe type dolls with thick molded hair and Barbie (as shown), Teen Skipper (as shown) and her little sisters with puffy hair (as shown on New Staci).  The smaller boys and girls of the Barbie and Ken family can NOT wear it because their heads are too small.  HS Musical (as shown on Chad) and Monster High dolls can wear the hat as well.  

I no longer put Velcro in the hats to help hold it to heads with hair because I had complaints that the little hooks messed up the doll's hair but you can easily purchase and add a piece of sticky back Velcro inside the crown if needed.  (Note: Velcro also helps a hat fit better if it is a little loose because a doll doesn't have enough hair).