The EFX bracelet improves balance, strength, flexibility, and endurance. As said in the product's description:
Our holographic embedded product now available in multiple colors to fit your personality. EFX is a technology designed to maximize performance and overall well-being by increasing balance, strength, and flexibility. Made from water resistant and stretchable silicone with two holograms. Designed for the active sports enthusiast.
Here are just a few of the different color options.
If you are skeptical, then find out for yourself by doing the balance test in a store near you.
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