Both have the SR-91 in them.However, copper is a "contrast" lens, grey is neutral.See their website: http://kaenon.com/sr91/KaenonLightTransmission.html

Nope -- polarized vs. standard is just a lens difference. The "Asian fit" version often works for those with a smaller/flatter nose bridge and/or larger head though.

The few detail views that have an amber tint would indeed appear to be the "shallow blue" model. The others that appear grey or blue are this "deep blue" model.

Oakley's site actually lists them for men, not women, though like many Oakley men's glasses, women do wear them too. I suppose they're unisex.There are only a handful of Oakley models like the Disobey, Behave, Betray, Ravishing... that are really just for women.

The polarized lenses would help you, as would the hydrophobic properties of the lenses. This "angling" version filters colors for fishing, however. Try the normal flak jackets.

Any listing I find elsewhere says 2.75mm.

The more expensive one has "thermal" in its name and is 300 weight fleece.

You don't need any tools. It'll probably take you a couple times to get the hang of it and know what you're doing, but it's not hard after that. The main downside of lens changing is that you need to hold the lenses in a way that you're virtually guaranteed to need to clean them immediately after (via microfiber cloth, etc.). If you might be changing lenses daily for some reason, I'd suggest getting a second frame to minimize risk. If rarer -- like just every weekend, or every month -- it's not a big deal.

(1) Yes--the Radar frames take any Radar lens shape.(2) Beware which frames you have. Some like white chrome and polished aluminum can peel when scraped while you change lenses in particular. Changing revolves around pinching the nose piece, then popping the bottom of the frame away from the nose piece. It's easy after that. For the new one, you put the sides in, then the top edge, then deal with the nose piece (reverse order of removal). You can find instructions at Oakley.com and a couple other places on the web:http://oakley.com/customer_service/removal_radar