18oz. tartan?

[mookien]

Dutch Friendship Tartan, a Lochcarron woven tartan, is now available in 18 oz, so I assume that Lochcarron also does some special order in 18oz.

Is this kind of information available anywhere on their web site, or do you have to contact them and make a direct inquiry in order to obtain it? All I can locate is their "HIGHLANDWEAR & TARTAN" page that shows available tartans in their three standard weight ranges.

Thanks.