Used once or twice only! Our travel-ready dpl® Light Therapy Neck Pillow system uses infrared and red light to provide quick relief of neck pain, stiffness, and muscle spasms. This comfy, soft, high-density foam neck pillow delivers comfortable relief to the area where you need it most. But, unlike a heating pad, infrared light therapy works below the skin’s surface reaching deep into tissues, stimulating cells, and increasing circulation to target pain at the source.