Hrm.. that's a tough one. I'll have to consider.
Meanwhile, be sure to knit at the tightest gauge you can. Definitely tighter than the ball band suggests. That helps a lot with durability.
You can also use the 80/20 wool nylon blends, which are stronger and still wonderfully wooly. I know they're hard to find in solids, though, and sometimes the most enticing yarns just don't have the nylon.
I'll sleep on it and post any brilliant solutions that come in my dreams!
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