Alpinestars RC Back Protector Features CE-certified lightweight, flexible protection Impact-absorbing expanded polymers and open-cell padding construction Waterproof outer cover Fits standard Alpinestars back protector compartment Use the size chart to find the size RC Back Protector you need to fit your Alpinestars jacket Please see below chart for protector measurements Size Measurements Small 14 Height 9.25 Widest Point 7 Narrowest Point Medium 16.5 Height 11 Widest Point 8 Narrowest Point Large 18.25 Height 12 Widest Point 9 Narrowest Point (function() var cycle true ('table.sizechart tbody tr').each(function(row) classname (cycle !cycle) 'light' 'dark' row.addClassName(classname) ) )()