If you suffer from muscle strains, upper back ache, shoulder ache, Thai Herbal Comfort – Upper back is what you need, heat it for 2 minutes in the microwave at 600 watt or 1 minute at 800 watt and apply it, the effect of the Thai herbs will relieve the tensions in your muscles, improve the blood flow, and the lymphatic system restoring the harmony of your body and mind. This item is also useful in easing breast engorgement.