Headroom Smart Offset

headroom-smart-offset.js

// -- headroom ---------------
(function($) {
  var headOffset = (app.obj.$section.filter('.feature').height() / 2) - (app.obj.$header.height());
  app.obj.$header.headroom({
    'offset': headOffset,
    'tolerance': 5,
    'classes': {
      'initial': 'animated',
      'pinned': 'slideDown',
      'unpinned': 'slideUp'
    }
  });
})(jQuery);