A rod pocket, also called a pole top or casement, is a drapery header that is sewn at the top of the fabric in order to make a pocket in which a rod can slip through. This creates a space where the rod can be hidden and hung with no hardware necessary. The only parts of the rod that show are the ends which are typically covered with end caps for decorative purposes. Most commonly, sheer drapery is hung with a rod pocket and then tucked underneath a more opaque drapery.
