Find your flange fit. Pump with confidence.

When it comes to wearables, sizing is different — you'll need a fit that's more snug. Most moms find that adding 1-3mm to their nipple size (or 0-2mm if you're pumping with Willow 360) results in optimal output and comfort.

Still need your nipple measurements? Try our sizing guide

Sizing inserts can only be used with a 24mm flange or 24mm container insert.

Questions? Our experts can help.
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How To Find Your Nipple Size

Step 1: Get a measuring tape

Measure the diameter of your nipple at its base while erect to determine its size accurately.

Step 2: consider sizing up

Most moms find that adding 1-3mm to their nipple size results in optimal output and comfort.

Step 3: take a look at our chart

Match your measurements to our sizing chart to find your recommended size flange / insert.