Devold has a shell top made out of 100% merino wool without any DWR or coatings.
There is always a natural alternative, and therefore we have designed a wool shell jacket and bib pant in 100% merino wool, made especially for ski touring. The Devold® Trollkyrkja collection is a wind- and water-resistant outer layer developed for high-intensity activities where the need for...
www.devold.com
Believe it's made from this stuff
Using the latest OPTIM™ spinning techniques, Woolmark and Nanshan have created a windproof and waterproof fabric made from 100% Australian Merino wool.
www.woolmark.com
Though I'd guess it's more expensive than ventile, and almost impossible for a DIYer to get hold of.