Yes, they last for months. The recommendations I made will get you months of wear with regular exercise. Poly around the back and sides of a unit is unnoticeable to the wearer. The clips are made of plastic and can be detectable to touch. Clips are not recommended if you wear a unit to bed as it causes traction alopecia---the clips pull out the good hair that they're attached to. Clips are o.k. for wearing during the day if you take the unit off when you sleep.