Looks like a wool knit hoody but it's made from Polartec® Thermal Pro®.

It seems like every active wear manufacturer has at least a half dozen hoody offerings but Arc'teryx made their Covert Hoody strikingly different with an innovative Polartec® Thermal Pro® sweater knit fabric. The fabric looks like wool but it's easier to launder and doesn't have the permanent stretch concerns. Beneath the sleeves are underarm gussets so you can extend your reach above your head without feeling exposed down along the hem. The Arc'teryx Covert Hoody is functional outerwear for hiking running and camping in cool weather.