Non-slip rubber tip arms
Foam backing for extra comfort
Hydrophobic coating - water repellent
Costa Rica surf sunglasses stick to my brown when I wear them which makes them difficult to keep in place. The ventilated frame is covered by the padding on the inside, and has no effect. The ventilated lenses are still effective. Some fogging occurs with these glasses.
If you really want a pair of these, I can hook it up. Send me an email. Tony@WearSurfGlasses.com