woocommerce_get_image_size_(image_size) filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_get_image_size_(image_size)', 'filter_function_name_6500' );
function filter_function_name_6500( $size ){
	// filter...

	return $size;
}

$size

-

Where the hook is called

$size = apply_filters( 'woocommerce_get_image_size_' . $image_size, $size );

Where in WP core the hook is used WooCommerce