Ixs kronos evo mtb helmet with full inmould coverage for optimized absorbtion and weight the kronos evo mtb helmet comes with the aeration system with 24 large vents and internal air channels features snapon visor for easy fix and remove dual compound dial adjuster ergo fit ultra fully flexible and adjustable retention system dual compound head ring for highest comfort and optimized fit y clip adjustable strap system ratchet safety closure sm 54 58cm ml 58 62cm en1078 certified weight