I am a pharmacist and suffer with lower back pain from standing all day. Thermotech is the best heating pad on the market (and believe me, I've tried many). The secret to real pain relief is MOIST heat. Cheap heating pads don't get hot enough and you have to keep rewetting a sponge inside the cover to get moist heat. This heating pad's cover uses the humidity in the in the air to provide moisture. Yes, it really works! I like the four temperature settings too depending on the type of clothing I'm wearing. Thermotech also makes this heating pad in a version for your upper back and shoulders that I also love. I started to order this heating pad from my drug supplier but decided to check Overstock first because they are rather expensive. I was shocked to find Overstock's price was half of what I could order it for. I'm so glad I checked. This is the only heating pad I recommend to my customers. You won't be disappointed.