AolesyMen's 2 in 1 Running Pants, Gym Workout Compression Pants for Men Training Athletic Pants

Are they lightweight? Or do they feel thick? I want to try these but im not a fan of working out wearing thick piece or heavy clothing

I’m a size 34 waist. 5 feet 11 inches. What size do I need?

does it have an underwear, if so, is it the same materail as he leggings?

has any washed these in the washing machine? instructions say to dry clean only.