This really is a good idea to wear all year round. Then in winter it has the added bonus of rechargeable LED lights. Red at the front and White at the back It has elastic in two parts which means it fits most hat sizes. On the inside is a sticky rubber that grips onto the hat, to make sure it does not ping off if your head knocks a branch. It does not damage velvet hats. gently pull the small battery from the black plastic case (the wire is not long, around 1.5", so do not pull) and recharge with free cable that comes with the hat band. All hats are checked before sending out. The reflective EN1150 tape. Wipe clean with a warm soapy cloth. One Size fits most sizes and styles of riding hat. All reflective tape is 2” wide.