The simple answer is no, they are not. However, polarized does not refer to UV protection, it only refers to Anti-Glare.
In some specific conditions, polarized lenses can be inefficient for use during snow sports. Polarized lenses can make it difficult to differentiate ice patches as a result of sunbeams reflecting off the snow during downhill skiing or snowboarding. This can be very dangerous, because if the skier or snowboarder doesn't see where he/she is heading, he/she has no time to react and can fall.
For safety to consumers, it is highly advised to not used polarized lenses for this purpose. We used mirrored finishes with different VLT ratings depending on how much light filtration is desired as well as adding UVA and UVB protection. (Specific lens information can be found on the graphics here.)