A device for treatment of plantar fasciitis and/or Achilles tendonitis that comprises: (a) a calf strap removably engagable to the calf of a leg; (b) a foot assembly removably engagable to the foot of the leg such that when the device is worn the assembly can be positioned proximate to the ball of the foot intermediate to the midfoot and forefoot areas of the foot to secure it to the foot; and (c) a substantially inelastic tension member connectable between the calf strap and the foot assembly in a tensioned mannersuch that when the device is worn the plantarflexion of the ankle is limited such that the plantar surface of the foot is held in a neutral to slight dorsiflection. Also, a method of treating plantar fasciitis and/or Achilles tendonitis that comprises applying a such a device so as to maintain the plantar fascia and other structures on the plantar surface of the foot in a neutral to slight dorsiflection.