661 evo knee iiwith strategic d30 pads and panels vented compression fabrics and mobility patterns the evo knee ii stands alone d30 material hardens on impact yet flexes while riding fit and technology aside the redesigned evo collection helped launch the new padlock connection system which completely prevents pad migration before and during an impact with evo and padlock you will never have to compromise ever again featuresimproved sizing and more pre curving for a dramatic fit improvemen