The Smartwool Summit 1/4-Zip Sweater trades a pullover crew neckline for a zip that opens partway down the chest, giving a bit more control over how much neck coverage the moment calls for. The same heavyweight blend of merino wool, recycled nylon, and alpaca that makes Smartwool's sweaters warm and soft carries through here, with rib knit detailing at the collar, cuffs, and hem holding its shape wear after wear. It's an easy layer to zip up over a collared shirt on the way out the door for a cold commute.