Endura Grey Singletrack Mtb Helmet in Size XL Boys, Sports Direct. The SingleTrack Helmet is light in weight but heavy on performance, offering advanced protection and comfort for every ride. Featuring 3D-formed Koroyd® inserts in high-impact zones, it delivers superior energy absorption while maximising airflow for unbeatable breathability. Large vents maintain a steady flow of air, keeping you cool and comfortable on demanding trails—making this one of the most protective and lightweight helmets in its class. Key Features Lightweight in-mould construction Koroyd panels in high impact areas provide increased energy absorption Removable, adjustable visor offering a wide range of movement Large vents including top ‘air intake’ zone provide increased airflow One-handed micro adjust fit system with multiple anchor points for wide range of adjustment Fast wicking, quick dry, soft touch, removable padding Goggle friendly design with rear strap gripper Endura Helmet Sizing S/M M/L L/XL Head Circumference (cm) 51 - 56 55 - 59 58 - 63 Head Circumference (in) 20 - 22 21.5 - 23.25 22.75 - 24.75Looking for alternatives to stores like JD Sports, eBay, SHEIN, ASOS, Next, Best Choice UK, Very, Decathlon UK, Argos, schuh, Temu, BuyBetter, or Nike Official? Discover our unique selection.