This sweater contains merino wool fibers that are an extremely breathable, active fabric that reacts to changes in your body temperature keeping you cool or warm Very fine fibers feel luxurious and soft next to your skin This garment's fibers are really reactive and will stretch and move with you, yet return to their natural shape after each wear and wash These fibers are resistant to wrinkles and have an outer layer of protection that prevents stains from setting in This classic v-neck merino sweater looks great when worn with Calvin Klein chinos for a dressy refined look