Hydrafoil Rx

These Authentic Amphibia polarized sunglasses are designed to float within a power parameter range of -4.00 to +4.00. They fit medium frames and have a lens color matcher.

• The description claims that power parameters between -4.00 and +4.00 are guaranteed to float.
• The description advises against using any form of strap on the frames, as it may void the float warranty.