Yes. With many child restraints it is recommended that the child not wear a heavy coat under the harness straps as the bulk will compress during a crash and the straps would be loose (CPS technicians typically suggest nothing thicker than sweatshirt material under the harness strap). However, a child can wear a heavier winter coat underneath the Ride Safer Travel Vest. (We still recommend taking it off for more comfort and better temperature control as the car warms.)