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Beware the shrink on the new generation cotton lined M41's - my dad is disappointed that his shrunk so much in the wash, and the lining wasn't as thick as he'd hoped. I'm currently torn between the cotton lined and twill M41.....
I would only ever dry clean a Tanker or M41. They have had mentioned that for years on the website. They do say the new ones are washer safe but I would not risk it.