Advance custom field

The codes below suits on product subcategory looping.

Get the custom field of every subcategory ( inside the loop ).

$sub_title = get_field('sub_title', 'product_cat_'.$category->term_id); 
if( $sub_title != '' ){ echo $sub_title; }

Get the check-box label text.

$s_field = get_field_object('field_name', $product->id );
$s_value = get_field('field_name', $product->id );
$s_label = $s_field['choices'][ $s_value ];
if( $s_label ){   
	$html .= '<li>field_name : '.$s_label.'</li>'; 
}else{
	$html .= '<li>field_name : None</li>';
}