CRZ YOGAWomen's Naked Feeling Gym Leggings Squat Proof High Waist Yoga Pants Sports Tights with Pockets - 25 Inches

Are they see through? Or squat proof

Does sweat come through and show as sweat patches?

Are these lycra material or more lounging cottony material?

Sizing - its unclear if the size options are us or uk - can anyone help please? i am uk 14-16 & don't want to end up with a pair that's too big!