With wool garments I don't put them in a washing machine. Just soak them in a bucket in cold water for a day or two when they need washing with a very small amount of detergent, then rinse and let drip dry. Don't use a clothes dryer. They don't shrink if you do this and last a long time.
At the price of these garments cost, It’s well worth taking precautions for longevity.
I bought a few t-shirts, for myself and my son on a product intro promo deal a few years back.
He complained that his was itchy and refused to wear it.
Of course it was a couple sizes too small for me, but I still have mine in XXL .
I’d like to find his and make a neck tube, or bandana of it, Ha
Gentle washing is very worthwhile !
Cheers