Abstract: Removable headwear is provided for therapeutically applying a permanent magnetic field to hair follicles located in the scalp to retard hair loss and promote hair re-growth. A flexible sheet of magnetic material having a plurality of alternating north-south poles is placed with a head covering that is in turn placed upon the head of a subject. Such head covering, while suitable for nighttime wear, may not be deemed socially acceptable for wear during the day. To enable the subject to maximize the exposure of the scalp to the magnetic fields, the head covering is configured to permit an item of conventional headwear to be placed over and cover the inner head covering.