The Nutcase Little Nutty helmet range is an industry leader for safety and comfort and now features the MIPS safety feature and baby specific EPS protective foam, designed to disperse any force and protect their growing brains. The updated design provides maximum comfort and fit, while focusing on head support and posture for their little neck and head. No pinching and no tears with the updated Fidlock magnetic buckle system. SIZING: Fits head circumference 48-52cm (please measure circumference 1cm above eyebrows) FEATURES Updated design provides maximum comfort and fit while allowing optimal head support and posture Rotational motion and force can cause brain injuries. MIPS is a low-friction layer that sits between your baby's brain and the helmet. The liner slides 5 to 15mm in all directions if there was an impact, reducing forces to their brain Lightweight polycarbonate outer shell designed with baby neck strength in mind. Updated Fidlock snap-and-go magnetic buckle system means your baby won't get pinched which means no tears!