Leatt’s 5.5 Pro HD Chest Protector was specifically designed to meet the highest safety approvals for front, back and shoulder impact protection. The Pro HD also has added Hardshell flank protection lined with 3DF foam. This flank protection overlaps with the front and back plates creating an integrated, multilayer protection area. It has also been designed to integrate perfectly with all Leatt neck braces although it works equally well without a neck brace. 47 front and rear venting slots help keep you cool. Adult size fits riders from approx. 150 to 190 lbs, XXL size fits riders approx. 190 to 240lbs.