From the manufacturer's website:
Are you getting the right protection from your pad? Did you know that 60% of women are wearing the wrong size pad? Using the wrong pad size can lead to leaks. Step up in size to help stop leaks. Now you can find your fit with Always My Fit, a tailored sizing system to help you find the best protection based on both your flow AND panty size. Use the sizing chart in the images to find your fit for day and night. For our best nighttime protection, Always Maxi, Size 5, Extra Heavy Overnight Pads With Flexi-Wings have a 2X larger back to help stop leaks at night,* plus a LeakGuard Core that absorbs in seconds and gives you up to 10 hours of protection.
*These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease.