I think unless it actually says self striping it is probably variegated. I have used "Memories" and it is variegated. They do have some new self striping ..."Felici" ... I have blue, brown and a pink, purple green ... I don't remember their names. It has the same 75/25 fingering weight as "Essential" and both are yummy soft!
I am DebbieKnits on Ravelery