Warning: Spoiler! (Click to show)
It's 100% wool. It has some weight to it also. I was contemplating a Burberry shawl cardigan, but it was $800 on sale ($1495 list price). The Burberry was wool/cashmere, which I'm sure was top quality, but the RRL Shaker was on sale for $225 ($395 list) and its pretty well constructed, loving the fit and the wool.