You can also apply regular elastic (right along the edges between the elastic points on your pattern--you can zig-zag it on to the edge or sew it down the middle) then bind the cover with strips of PUL (cut 1" strips)--just sew all the strips into one long strip long enough to go around your cover; remember to stretch elastic as you sew the PUL over it. DO NOT use bias tape--it will wick horribly!!!! HTH