<div class="col-md-4 col-lg-3 product_mini_fiche demo">
    <div class="mini_fiche_holder">

    <div class="mini_fiche_holder_img">
        <a href="{{ path('product_front_show', {'id': product.masterVariant.id, 'slug': product.slug }) }}">
            <img class="img-responsive" src="{{ asset('uploads/documents/' ~ product.path) | imagine_filter('frontlist_thumb')}}" />
        </a>
    </div>

    <div class="mini_fiche_holder_name">
        <p><a href="#">{{ product.name }}</a></p>
    </div>
    <div class="mini_fiche_holder_price">
        <p>
            85&euro;
        </p>
    </div>

        </div>

</div>
<div class="col-md-4 col-lg-3 col-xs-6 product_mini_fiche demo">
    <div class="mini_fiche_holder">

    <div class="mini_fiche_holder_img">
        <a href="{{ path('product_front_show', {'id': product.masterVariant.id, 'slug': product.slug }) }}">
            <img class="img-responsive" src="{{ asset('uploads/documents/' ~ product.path) | imagine_filter('frontlist_thumb')}}" />
        </a>
    </div>

    <div class="mini_fiche_holder_name">
        <p><a href="#">{{ product.name }}</a></p>
    </div>
    <div class="mini_fiche_holder_price">
        <p>
            85&euro;
        </p>
    </div>

        </div>

</div>
Test for 2 col on mobile
[Layout] Test for 2 col on mobile
