Does your fabric slip while you are working?  Try Stitchers "no-slip" hoop tape.  You will find that this holds your fabric tightly and eliminates that annoying slipping.  This tape does not leave a residue on your fabric and works on both wood and plastic hoops.  One side is rubber and the other side is semi-adhesive.  the width is 1/4" and fits most hoops.  Each roll of tape has 9 yards.