Usually a size XS but I sized down to XXS based on comments that these run large. XXS fits perfectly! Except for the length​,​ way too long but fine with boots. Material seems stretchy thick and strong​,​ and there is a zipper on each leg opening although I don't see myself unzipping it. Love the material​,​ comfort level and fit​,​ just wish they made a shorter version. I don't see myself wearing these to the gym​,​ just out and about. And they feel kind of dressy​,​ and probably could be except for the "alo" label by the back​/​side of the left knee.