Panama Jack Neoprene Floating Sunglasses Cord (Green)

This is the best eyewear retainer I've ever used. I wanted one that keeps my glasses securely on my face. Others I tried were designed so you can take your glasses off, and have them around your neck, which is not great when you're swimming, because your glasses just fall off. Some don't slide far enough onto the ears of my glasses, leaving a gap, so my glasses slid up and down my nose. This strap can be adjusted to your desired level of tightness. I wear prescription sunglasses when swimming, or I am blind. These hold my glasses on while swimming and flopping around in the pool, or riding rides at a water park. They also held them on in the ocean, even when hard waves came down and tossed me around a bit. I also love that they're made of sturdy neoprene instead of fabric that absorbs water. I let my 8 year old neice borrow it for a trip to a water park, so they fit smaller sized heads as well as large heads (like mine). I highly recommend them to anyone who needs a serious eyewear strap that can withstand literally any outdoor activity.