What a quandary for me because the prayer shawls I knit are acrylic, which is washable. My cousin, however, emailed me the following: “These days, specifically due to the biodegradable issue, wool is processed so that it goes in the washer and dryer - all natural. It's called ‘superwash’ wool and comes in all thicknesses. Not expensive either depending on how fine a wool you choose.” She also gave me a web site <http://www.yarn.com/>from which she orders her yarn. Lucky me, it’s in Northampton, MA where my son lives. I’m getting ready for a field trip.