this has tight ends. So we used a tweezer to open up the ends to slip in sunglasses.
 the foam is a "plug" slipped into a tube.

I flipped my kayak..and did not notice my glasses had some off but luckily someone else had. Saved my new Serengeti drivers.

I love these.

I think one end came off but they still floated.

Great product. Not too clunky.