Country

$tax_query = array(
	'relation' => 'AND',
	array(
		'taxonomy'         => 'pa_country',
		'terms'            => 'uk',
		'field'            => 'slug',
		'operator'         => 'IN',
	),
	array(
		'taxonomy'         => 'pa_groesse',
		'terms'            => '75',
		'field'            => 'slug',
	),
);