Long Lasting and Fast Acting: Acts in about 10 minutes and last up to 8 hours soothing. Especially for the neck. Also can ease knee, back, shoulder and other joints aches. Ergonomic Design for Neck: Unique ergonomic shape, better fit to the muscle bone, not easy to fall off, ensures full soothe in neck. Applying our neck patch will not interfere with daily life, pretty suitable for bedtime. Natural Herbal Self Heating: 100% natural. Artemisia extract active ingredients, also contains capsaicin, ginger and camphor. While soothing, those powerful herbs continuously heating to promote blood flow & oxygen to loosen muscles and reduce soreness. Easy To Use: Simply clean the affected skin with warm water and dry, remove the protective film and stick the neck patches on the affected area. It will keeping stable and works quickly. Use one during the day and one before bedtime for better.