1. They are polarized which make them great to peer below the water and check out all the plant life and fish you wouldn’t normally see.
2. They have this ingenious integrated and comfortable custom retainer (neck strap) with quick release clips that effortlessly pop on and off, plus sliding cables to make it easy to wear and adjust to every head shape. These secure your glasses in case you fall or just want to take them off for a second without have to store them in a pack.
3. They have a rubber piece that runs across the inside top part of the frame which helps to keep them from moving around and also ads another level of comfort
4. They come with a high quality hard zipper case that includes a quick release clip for attaching to your board, backpack or anything else you can think of and a high quality cleaning cloth so you won’t scratch your lenses.
Another thing I noticed was the flexible hinges which, for big-headed guys like me, makes all the difference for a comfortable, snug fit without squeezing my head too hard.
I highly recommend you grab a pair of these for you next standup paddling adventure: http://www.hobiepolarized.com/shop/collections/hydro.html