Helmet bicycle spokey pumptrack 53-57 cm blue 944785 & nbsp; helmet bicycle spokey is mandatory part part equipment each each lover ride ride on bike, hu likes, rollers etc. ultra -light model gained inside foam eps, kt & oacute; ra cushiones vibrations and absorbs force shock shock during fall. Adjusting H EADLOCK facilitates matching. Fastening in form buckles facilitates removal and putting. Holes ventilation. & nbsp; data technical: & middot; system regulation system Ji: Head Lock & Middot; Adjusting circumference: 53-57 cm & middot; norm: CE, 1078 & middot; coating outer: ABS, In-Mold & middot; internal layer layer: EPS & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp;