Living here in Vermont, we have tried so many different winter gear brands for our own children, but we have to say that hands down the BEST we've ever come across for warmth, dryness, and overall quality is Deux par Deux. This adorable little infant car seat (or use it in the stroller too!) insert has openings in the back for the standard 5-point harness safety belts to slide right on through. Coordinanting hat and fleece stroller blanket included. Insulation adapts to the shape of the body and promotes air circulation.