what's the difference between comfort fit and comfort flex Wangler jeans?

comfort fit has a lot more room in the butt and thigh...I found them to be very baggy comfort flex waisband are regular wrangler jeans, but with stretch material in the waist. the jeans stretch a little too

Do these jeans fit over boots?

Yes. And they are extremely comfortable for riding my motorcycle.

Are these relaxed fit or regular fit?

these are regular fit with a stretch waist band

Are these somewhat tapared down by the ankles?

This one is not tapered, it's straight, but I do own a pair that is tapered. Same great waistband, but a little closer fit. I bought them a Target, but I'm sure they are available from Amazon.