This is a refill that fits into your existing SunShield SPF 50***.

1. Twist the shoulder of the original bottle counterclockwise to detach the inner bottle from the outer holster.
2. Remove the screw cap on the refill bottle and replace it with the pump from the original inner bottle.
3. Align the refill bottle to fit into the outer holster and twist it clockwise until you hear a satisfying click.