It's no secret that layering is the key to staying comfortable when it's cold, but nailing that perfect combination of clothes is easier said than done, especially when you're dealing with demanding youngsters. Even the pickiest grom will be hard pressed to dislike the Marmot Ajax Down Vest, though, which blends core warming 700 fill down with a water repellent DWR coating to help your monster stay cozy whether he's on the slopes, heading to school, or horsing around in the backyard. Down's famous for being supremely warm, light, and compressible, so it's no surprise that the Ajax is, well, warm, light, and compressible. The fabric is polyester ripstop, which prevents leakage and escaped feathers, and is finished with a water repellent treatment that encourages moisture to bead up and run off rather than soaking into the fabric and compromising the insulation. A soft chin guard prevents the zipper from irritating his face, a wind flap behind the zipper helps keep drafts at bay, and two zippered hand pockets make sure he makes it home with his phone intact.