EDELRID Ultralight Junior Helmet ADJUSTABLE, OPTIMAL FIT: The Ultralights design features a fully adjustable head strap and chinstrap for an optimal fit. It fits a head circumference 48 - 58 cm (18.9 - 22.8 inches) and has detachable, washable headband made of synthetic leather. HYBRID HELMET DESIGN: Our Hybrid Helmets combine the benefits of both hard and soft shell helmets. The outer shell is robust, impact-resistant ABS, while the inner EPS (expanded Polystyrene) foam shell provides excellent shock absorption. This is a robust choice for an all-rounder helmet. SHOCK ABSORBING EPS: In the event of impact, the EPS (expanded Polystyrene) foam core absorbs energy, which progressively buckles upon impact. The outer polycarbonate shell protects the EPS core and helps spread impact energy throughout the entire helmet. EXCELLENT VENTILATION: This classic helmet provides superior ventilation with an ample number of vents to ensure a constant supply of fresh air, helping you stay comfortable on your next climbing adventure. TRUSTWORTHY EXPERIENCE: Our Company has 150 years of rope making and alpine equipment experience at your fingertips. Our years of hard work have rendered products that you can trust on your childs next climbing adventure.