MaviMen's Matt Mid Rise Straight Leg Jeans - Premium Relaxed Fit Denim Jeans

Are these wrinkle-resistant (considering for a young man who doesn't know what a clothes iron is)?

what are these jeans made of? 100% cotton or does it have % of elastane or spandex to them?

I found these by searching under lightweight summer jeans - would anyone who owns these categorize them that way?

Does it have buttoned fly?