As a certified Caregiver, I have found rejuvination and comfort wearing the ZGlove arm and leg sleeves when my day demands the most of me. All I can say is you “feel” something going on while you’re wearing it and it feels good. I also like the added skin protection element since my job exposes me to all sorts of conditions. Thanks ZGlove for a great product that takes the edge off my day whether I’m working or playing. Allan W., Bakersfield CA