.image-fixed-size-and-vertical-middle {
    width: 40px;
    height: 40px;
    vertical-align: middle;
    padding-top: auto;
    padding-bottom: auto;
}<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet"/>
<ul class="list-group">
    <li class="list-group-item">
    <div class="col-xs-3 col-md-2">
        <div class="image-fixed-size-and-vertical-middle">
        <img class="img-responsive" src="http://placehold.it/122x122">
    </div>
              </div>
    <div class="col-xs-9 col-md-10">
        <h4>header</h4>
        <p>content</p>
    </div>
    <div class="clearfix"></div>
    </li>
  </ul>The image is in the top of col. how to make it vertical middle?
 
     
    