Little Nutty Helmet MIPS Toddler (48-52 cm)Nutcase sets the standard for fun when it comes to kids helmets. The all new Little Nutty raises the bar again featuring industry safety leader MIPS in addition to being filled with protective Crumple Zone EPS foam. Now offered in two sizes, the Little Nutty ensures ultimate fit and comfort for kids ages 3 and up. With new designs and 11 contoured air vents, we not only want kiddos to look cool, we want them to remain cool. Nutcase Helmet Sizing Chart