with the indoor/outdoor runner, it will leave a nice unfrayed edge when you cut it to size, although you can sew an edge on it, but its an unnecessary step that adds nothing to the cosmetics of it.... in my opinion
the PO of my boat had automotive carpet in it with a finished edge... the carpet was very light weight with no nonskid backing and had velco holding it in place, so it would shift under foot and still come loose at the velcro sometimes...
this new stuff is so much better in looks and function as it stays put.