Floating
Dry wipe pouch
Rubber tip arms for additional comfort and hold
Rubber nose pads for impact resistance and non slip comfort
 
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