Our youth snowmobile helmet now comes with an ELECTRIC SHIELD! Comfortable and stylish, this set up is everything your child needs to enjoy the ride as much as you do Double pane, anti-fog shield electric heated shield opens and closes with ease Extra long cord included to be hooked up to either your built in RCA plug or directly to the sleds battery Breath box included to deflect warm air and further eliminate fog Meets the DOT standard (FMVSS 218) To ensure proper helmet sizing, use our size chart and follow the instructions below. Take a head measurement with a cloth tape measure. Wrap the tape measure around the childs head one inch above the eyebrows, directly above the ears and to the widest area at the back of their head. This will give you the circumference, which is the measurement displayed. Please note, due to varying shapes, heads that are apparently the same size when measured by a tape may not necessarily fit the same size motorcycle helmet. So remember, this is a rough guide, a starting point, and depending upon your head shape, this step alone may not provide a perfect fit. Made for kids ages 5+ Lightweight, true youth sized smaller shells, not over padded adult helmets. Quality and comfort Soft and comfortable interior with removable and washable liner & cheek pads. Standards you expect Meets Department of Transportation (DOT FMVSS218) requirements.