The Strassburg Sock is easy to use, comfortable, and provides proven relief of plantar fasciitis heel pain. . One sock: Regular size fits calf size up to 16 in. measure around calf at widest point. Construction: Tubular knit material that fits over the calf with 2 attached adjustable straps to maintain the foot in a neutral to slightly stretched position. Easy to use designed to keep tension on the tissue plantar fascia, so it heals in a stretched position at night. Holds the ankle and forefoot joints in a position of slight dorsiflexion that prevents a position of plantar flexion the plantar fascia is not allowed to contract. Can be worn to bed provides no significant restrictions and will not interrupt normal sleep if worn as directed does not allow the plantar fascia to contract while in the prone or supine position. Wear at night device applies a force which results in the reductionelimination of pain experienced during those first steps in the morning. Can be worn safely for several hours without adverse effect when applied properly. Does not lock the ankle joint into any one position, thus allowing some movement between the various joints, preventing possible joint compression pain. Over time, can help strengthen the arch of the foot. Provides low cost relief of heel spur symptoms. Can supplement, and not interfere with, traditional treatments by a doctor.