Through an exclusive partnership with KTH Royal Institute of Technology (KTH) and Mips, we shared our helmets CAD designs and studied the malleable skulls of young children with Finite Element Analysis (FEA). Because childrens heads are softer and still growing, using low density foam - and more of it - was the outcome of this partnership.Key Features:MIPS Essential Core.Integrated LED tail light for increased visibility in in both bright and low-light conditions.Headset SX fit system with youth oriented sizing that's designed for an easy and accurate fit.4th Dimension Cooling System to optimize ventilation.In-molded shell improves strength and reduces weight.Tri-Fix web splitter for improved comfort and ease of strap adjustments.Stylish, youthful designs complement our bike graphics and colors.Clip-on visor included.49-55 cm OSFM child size, approximately up to age 7.