I think both are 100% merino wool. The switchback is a thick wool material, with a slightly bumpy texture. Not thin at all, but not like a bulky sweater either. You don't say which Ibex sweater you are looking at. The switchback pullover is somewhat form fitting, which makes it good as a mid layer.
Sometimes I wear my switchback vest over my switchback pullover- and then I'm SUPER toasty warm!



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