FITEXTREMEWomens MAXHEAT Fleece Lined Performance Long Johns Thermal Underwear

How warm are these? I am going to a nighttime football game and it will be cold (I freeze) when most people don't). Are they really warm?

I wear size 4 pants. i am 5 ft 8 and thin. i would normally order a small in USA sizes. what size for these?

Can you wear them under skinny jeans?

Hi what size should I get if I’m a woman weight 150 5’2?