Therapeutic Heated Fleece Hand Mittens Microwavable hand mitts provide therapeutic warmth to help improve circulation, relieve pain, ease stiffness and improve flexibility. Great for anyone who suffers from arthritis and stiff joints. Simply heat the mitts in the microwave for 30-40 seconds and they retain the heat for long-lasting, soothing relief. Soft fleece mitts contain buckwheat filling for instant and long-lasting warmth. Spot clean. One size fits all.