suoso Sports Polarized Sunglasses for Men: Womens UV400 Protection Sun

From the brand

Are the lens scratch proof ?

More like very scratch resistant, great glasses!
I’m very keen on fishing. Does this help me?

Yes, these sunglasses do a good job of removing glare from the water, I use them a lot for fishing.
Are the lenes glass or plastic?

TAC. It's lighter than glass and won't be tiring to wear.
Are these anti glare? Meaning, will I see glare if the sun is behind or on my side ?

Yes, anti-glare polarized sunglasses for men. The shape of sunglasses is a little wrapround, so you won't see glare when the sun is behind or on your side.
Are replacement lenses available for these, and where could i find them?

I contacted them and they replaced whole pair when lens got scratched