Hammock
 
These are cotton material on one side and soft lining for comfort on the other.  These are designed to fit into the Desire More show/travel pens.  Each pen has four hooks that clip into the corners of the pen.  The pen has fixings in each corner so that the hammock can be attached to either side of the pen or one on each side.  
These are available to match the Desire More pen fabrics or you can choose a different colour.