Jesus used wool blankets

Well I'm quite sure he must have had wool blankets with all the sheep in that country and all that good Shepard talk, besides what else was available?  Even today wool blankets can insulate better than other types of blankets against heat and cold, to help maintain a comfortable body temperature in every season or climate. Woolen blankets are naturally flame-resistant. One thing to look for is blankets that are moth-proofed. I lost some of my good wool blankets to the moths, I had them over 30 years, I should have stored them better.
Wool blankets keep you warm when wet

Wool blankets will let the water out and keep the insulation value that's why loggers wear wool and hunters wear wool, you can help prevent hypothermia by having a wool blanket when hiking or camping, I use to have one in my car at all times got to put that back in the car.  When I was in the army all we had was woolen blankets and in basic training I was issued one blanket, let me tell you one thin wool blanket is not enough in February, even in Louisiana.
In Viet Nam I had wool blankets

 It does get damp and cold at night in Viet Nam so I am a real believer in the properties of wool.  It seemed that everything I owned was always damp or wet but my wool blankets kept me warm at night.  Merino wool is one of the finest, softest, grades of wool and can be woven to make it especially lightweight to give you warmth without the heavy feel of my old army wool blankets. Often the edges are bound with satin to protect the blanket from wear and you from any harsh edges.
What about washable wool blankets

Some wool blankets have a tag that says dry clean, but I believe that is just the manufacturer protecting themselves from liable if the blanket shrinks on you. It is up to you, but not one wool blanket I owned ever saw a dry cleaner.  If you pre-scrub the bad stains and soak the wool blanket for a half hour then use a gentle agitation wash cycle it seems to work ok.  Do not machine dry, hang the wool blanket over two clothes lines to dry after stretching and shaping it. Later you can lay it on the floor while still damp to stretch and shape again and brush it lightly to add a little fuzzy fluff to the wool.