High Speed delicates
Ever since my teens I have worn real wool sweaters, (and after reaching adulthood, a few precious cashmere), every fall and winter. I love a good wool sweater, it always suprises people how thin they are compared to the bulky scratchy acrylic things most people wear. (they are warmer too).
When gramma taught me to wash woolens, the rule was always low speed delicate, or handwash, with woolite and cool, (not cold), water, no exceptions, as she said anything stronger would beat the wool too hard, causing it to felt. I have had some sweaters for over a decade by following her methods, and they still look new. As much as some of them cost, I dont think I could bring myself to risk washing them in a machine with high speed agitation.
(Of course I always wear something between the sweater and my skin, to keep them cleaner, and every spring they are stored away with mothballs, also her rules, lol).