Unique color changing embroidered thread that takes affect under UV rays.  Watch the magic happen within a blink of an eye. 
For some fun, just add some sun; color changing quote in a blink of an eye, returns to original color with absence of UV rays

• One size fits most with adjustable hook and loop fastener
• Material: 60% cotton, 40% polyester
• Ponytail slot: 3.0" x .5"; perfect for pulling your messy bun or high ponytail through
• Great for all seasons and provides shade while running quick errands, marathons, enjoying outdoor activities