what thread to machine hem linen fabric?

I tried to find a fine linen machine sewing thread online.  
What I found, although beautiful and quality, was only recommended for hand sewing. https://wmboothdraper.com/Thread/thread_main.htm

I have all cotton thread, got rid of any blends a long time ago, so am wondering in this case what would last as least as long as the towels themselves?  

They are used at the bakery here for lining baskets to rise the bread so get washed and dried often.
I really resist any synthetics although I think that might be what the last seamstress used and the hems have held up well.

Maybe there's a hemp machine sewing thread?

I have read that poly thread can cut through the linen fabric like a tiny saw, especially after multiple washing. Seems like cotton is the right material, not sure about silk?

Ten days ago my parcel from Lithuania arrived with linen sample packs. I am still excited but apart from making pictures I haven't touched them yet. I have to make an idea what to sew - there are colours and fabrics great for garments, others will end up as napkins or gifts. Not sure yet, I am still in the brainstorming phase! (and with the cold approaching this is not a priority).
If anyone is located in Europe and is looking for a regional source, here is the link:
https://www.linenfashion.com/ (the category linen fabrics on sale has the different sets with very reasonably prized cuts; the amount and content of the sets vary through time so look often)

I am using European made linen thread.  You can see linen thread and fabrics from this seller www.fabric1yard.com

I've got my eye on this linen thread for machines: https://www.etsy.com/uk/listing/859103464/linen-bobbin-70-m-each-set-of-linen?ref=cart
I've bought from this seller before and she's very good to answer questions.  International post is a bit slow so if you are in North America, it's good to order a month or so before you need it.  

I understand trying to get the best supplies so that your made fiber goods will last for a very long time.
I have made "historic" clothing to fit (bespoke) for a very long time, and have never had a problem with a good quality poly or poly blend thread, even in chemises that get a lot of wear.

The cheap poly and poly blends are proof that you get what you pay for. I am slowly getting rid of all my cheap thread for this reason.
It makes good thread art and/or basting, or other things that are made/hand made, but not expected to take any wear or be worn.

Thank you all for the wonderful links to new to me places. I look forward to expanding my collection of quality supplies when I finally get through all the UFOs I have stashed away.