- Shell: Polypropylene PP shell for professional speed skates; lightweight, high strength and durable; highly impact resistant; improves starting explosivity and curve control for speed skating, roller skating and related activities. - Wheels and bearings: highly elastic PU wheels with high hardness; compatible with World Skate Rules; excellent rebound, roll and wear properties; ABEC-7 bearings for a smooth ride; suitable for competitions and long-distance skating. - Adjustable size: buckle allows adjusting the tightness to fit growing feet; designed to extend the skate’s life as your child grows. - Breathable comfort and fit: durable and dimensionally stable; 360-degree air circulation; triple protection system with cam lever buckles, straps and laces; aluminum alloy frame provides secure ankle grip; breathable inner shoes for comfort. - Use scenarios: training sessions and regular practice; competitions or racing events; suitable for growing children thanks to adjustable sizing and secure, breathable fit.