This is a Maniple and is made of Silk Fabric. The Maniple is embroidered with Cross designs and the ends are embroidered in floral designs. The Maniple is lined with satin fabric from inside.
Maniple is an ornamental vestment in the form of a band, a little over a yard long and from somewhat over two to almost four inches wide, which is placed on the left arm in such manner that it falls in equal length on both sides of the arm. It is worn only during Mass, not at the administration of the sacraments, during processions, nor at Benediction, etc. The colour of the maniple to be worn is in accordance with the liturgical colour of the day. The ends of the maniple are often broader than the upper part. In the middle and at each end the maniple is ornamented with a small cross; of these crosses that in the middle is always necessary as it is prescribed by the rubrics of the Missal. The maniple is worn by the subdeacon, deacon, priest, and bishop. (source: www.newadvent.org)