I'm not entirely sure what's with the collar (a turtleneck layered under the gray sweater?), but this sweater looks phenomenal! Probably my favourite thing in menswear in years. The cut looks great, the material seems to be thick cashmere for the gray parts and something else for the diagonal lines. I also really like how the lines don't stop where the ribbing begins, but continue into the ribbing and end at the hem.