The 397 is a replacement for the 661 style and is basically an improved version. It has Comfort + in it which is
a new pearlescent temperature equalising material integrated into the breast form. Essentially it reduces the body's temperature behind the breast form and so any perspiration is minimised. In practice it provides a comfortable constant temperature for the wearer. It comes in left and right styles.
Please state bra size, whether left or right breast form required and any special instructions in the box on the next page.