woocommerce/templates/global/wrapper-start.php

<?php
/**
 * Content wrappers
 *
 * This template can be overridden by copying it to yourtheme/woocommerce/global/wrapper-start.php.
 *
 * HOWEVER, on occasion WooCommerce will need to update template files and you (the theme developer).
 * will need to copy the new files to your theme to maintain compatibility. We try to do this.
 * as little as possible, but it does happen. When this occurs the version of the template file will.
 * be bumped and the readme will list any important changes.
 *
 * @see 	    http://docs.woothemes.com/document/template-structure/
 * @author 		WooThemes
 * @package 	WooCommerce/Templates
 * @version     1.6.4
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly
}

$template = get_option( 'template' );

switch( $template ) {
	case 'twentyeleven' :
		echo '<div id="primary"><div id="content" role="main" class="twentyeleven">';
		break;
	case 'twentytwelve' :
		echo '<div id="primary" class="site-content"><div id="content" role="main" class="twentytwelve">';
		break;
	case 'twentythirteen' :
		echo '<div id="primary" class="site-content"><div id="content" role="main" class="entry-content twentythirteen">';
		break;
	case 'twentyfourteen' :
		echo '<div id="primary" class="content-area"><div id="content" role="main" class="site-content twentyfourteen"><div class="tfwc">';
		break;
	case 'twentyfifteen' :
		echo '<div id="primary" role="main" class="content-area twentyfifteen"><div id="main" class="site-main t15wc">';
		break;
	case 'twentysixteen' :
		echo '<div id="primary" class="content-area twentysixteen"><main id="main" class="site-main" role="main">';
		break;
	default :
		echo '<div id="container"><div id="content" role="main">';
		break;
}