Bifacial solar panels have been around but these are now available as a semi-flexible panel too.
Given the amount of light reflected off the water one would assume an increased output over a single sided panel if mounted appropriately and the figures in the brochure seem to back that up. Looks good for mounting on a bare bimini frame or a rear solar arch to get some extra watts from the same available space.
http://www.giocosolutions.net/2face-bifacial/
No connection at all but here is their pricing.
Pre-order ONLY 1.60 euro per W 115W 184.00 euros + VAT 130W 208.00 euros +