Here's what other sites are saying:
The ultimate eyewear accessory for the water-based active lifestyle! It's both an eyewear retainer and a soft case (neoprene case floats in water).
When attached to glasses, the H2O/PEFD can provide buoyancy for even the heaviest set of frames and lenses. The H2O/PEFD also functions like the Techno in that the product can be broken down into the three pieces and form the sportsgrip and the clipcase/slimskin. However, the clipcase/slimskin portion of the H2O/PEFD is made from a neoprene material and will not provide the same lens cleaning capability provided by the microfibre.
- Vargo Outdoors