Features:

Floating design keeps them afloat if dropped
3 interchangeable Polaroid lenses, allowing the wearer to change lenses depending on weather conditions:
100% glare-free polarized dark lens
Yellow lens for light enhancement
Clear lens for changeable conditions, adding further versatility
Complete wrap-around design with venting channels to prevent misting
Integral retaining strap
Designed to stay in place in even the most extreme sailing conditions where normal sunglasses would be blown or washed away
Come in padded hard case for increased protection when traveling, for frame protection and lens storage
Comfort inner "Wave" foam for added comfort when worn for long periods

The floating styles are equipped with Polaroid Polarizing lens, technical name is S13. The support layers of this material is CAB (Cellulose Acetate Butyrate). It is a 7 layer laminate with a high quality scratch resistant hardcoating. The whole lens is presspolished and optically correct, optical class 1, CE standard.

CAB has advantages and disadvantages...
+unbreakable
+99% polarizing efficiency
+100% chipping free
+optically class 1, power readings and refraction is excellent
-fairly scratch resistant 2.5 HD
+lightest weight
+very good thermal stability
-distortion along frame edges possible