Just so you know- Ibex no longer makes Switchback items specifically because they were shrinking and distorting badly when washed in the washing machine, even on gentle. People were complaining and sending them back too much. KnottedYet had one that was a total loss. Switchback items are very risky to throw in the washer. I have several- the half zip, the full zip, and the vest...but I treat them as outer wear and haven't needed to wash them yet. I will be dry cleaning those.
On the other hand, I have lots of other Ibex items I throw in the washer (gentle of course). My Shaks are real champs when it comes to the washing machine. I tend to fluff them half dry in a low setting dryer (gets the cat hair off) and then lay them out to finish drying.