Choose from sizes: Medium, Large, X-Large **** As of 05/14/19 I have 1-2 medium and 1-2 larges otherwise they will be back ordered until 06/19**** Flexible Lycra made up of ceramic nano-particlesFabric emits far-infrared rays keeping neck and shoulder muscles warm and relaxedFeatures 27 magnets (1100 gauss) over key acupuncture points for stimulation of those areas – In ancient (and current) Chinese medicine, acupuncture is performed by using one's own blood to re-inject over targeted acupuncture points. The reasoning for this method is because the body takes quite some time to re-absorb its own blood after being placed in targeted areas – Therefore, prolonging the benefits. We have selected these magnets to serve to the affect by pulling the blood to those targeted areas which will continually stimulate those areas during and after the SmartHood is worn.Each magnet is enclosed in a soft cushion for enhanced comfortThe hood harmonizes bodily functions safely and naturally, stimulating recovery time, promoting blood circulation, increasing oxygen flow, and ultimately reducing pain and stiffness