Made to last, the Power Balance Sport Band NBA Bracelet can go anywhere you do. How do they say it works? Nearly everything has an inherent energy frequency. Some frequencies react positively with your body and other react negatively. When the special hologram in the Power Balance bracelet comes in contact with your body's energy field, it could allow your body to interact with the natural, beneficial frequency stored in the hologram. The results could be improved energy flow throughout your body. This durable 100% surgical-grade silicone wristband has a stretch that allows the bracelet to slide easily over your hand. Two mylar holograms gives you the confidence you need. Other potential results include flexibility, strength, balance, better recover, ion balance restoration and improved concentration and focus. Wear the Power Balance Sport Band Bracelet just for your sport or all the time. Sizing details: XS = 16.0cm, S = 17.5cm, M = 19.0cm, L =20.5cm.