global $wp_query;
$args = array_merge( $wp_query->query_vars,
array(
    'post_type' => 'product',
    'tax_query' => array(
        array(
            'taxonomy' => 'sort',
            'field' => 'slug',
            'terms' => $_GET['style']
        )
    )
 ) );

query_posts( $args );