You're not going to get them for $100 but Maui Jims'  Pipeline
model is the best I've ever used and I've gone thru many
high-end polarized sunglasses over the years.  They are the
lightest in weight and their frame/temple design won't let
them fall off.  I do a lot of twisting and moving around in my
little boat and have never had then even slip down much less
fall off.

Don't scrimp on your eyes.  There are reasons why some glasses
are so much cheaper than others and it's not all
"marketing".

http://www.mauijim.com/mjweb/public/catalog/consumer_sunglass_product.jsp?WS909FRAMESTYLEID=406&WS943IMAGENAME=LFG406-02.jpg

Dan

"Drill Here, Drill Now, Pay Less"

Deo Vindice