This vest is incredible! It begins to get warm after only 3 minutes. After 10 minutes, it produces a relaxation that is too good to explain. The amethyst produces a far greater relaxed effect than my jade/tourmaline mats. The weight is heavy at 12 pounds, but this vest is well worth it. The smaller vest is nice too, but at 5’9, this vest worked better for me. I love the fact that I can use it as a vest or lift the arms and use it as a flat mat! I really hope this lasts for years to come because it is absolutely amazing. The husband loves it too. Highly recommended!