function wc_product_post_class( $classes, $class = '', $post_id = 0 ) {
	if ( ! $post_id || ! in_array( get_post_type( $post_id ), array( 'product', 'product_variation' ), true ) ) {
		return $classes;
	}

	$product = wc_get_product( $post_id );

	if ( ! $product ) {
		return $classes;
	}

	$classes[] = 'product';
	$classes[] = wc_get_loop_class();
	$classes[] = $product->get_stock_status();

	if ( $product->is_on_sale() ) {
		$classes[] = 'sale';
	}
	if ( $product->is_featured() ) {
		$classes[] = 'featured';
	}
	if ( $product->is_downloadable() ) {
		$classes[] = 'downloadable';
	}
	if ( $product->is_virtual() ) {
		$classes[] = 'virtual';
	}
	if ( $product->is_sold_individually() ) {
		$classes[] = 'sold-individually';
	}
	if ( $product->is_taxable() ) {
		$classes[] = 'taxable';
	}
	if ( $product->is_shipping_taxable() ) {
		$classes[] = 'shipping-taxable';
	}
	if ( $product->is_purchasable() ) {
		$classes[] = 'purchasable';
	}
	if ( $product->get_type() ) {
		$classes[] = 'product-type-' . $product->get_type();
	}
	if ( $product->is_type( 'variable' ) && $product->get_default_attributes() ) {
		$classes[] = 'has-default-attributes';
	}

	$key = array_search( 'hentry', $classes, true );
	if ( false !== $key ) {
		unset( $classes[ $key ] );
	}

	return $classes;
}