Willow 360™ Flange Set (2-pack)
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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
Measured Nipple Size |
Willow Recommended Size Flange / Insert |
9-11mm | 13mm insert in 24mm flange |
12-13mm | 15mm insert in 24mm flange |
14-15mm | 17mm insert in 24mm flange |
16-17mm | 19mm insert in 24mm flange |
18-20mm | 21mm flange |
21-23mm | 24mm flange |
24-26mm | 27mm flange |
Sizing inserts can only be used with a 24mm flange or 24mm container insert.
Questions? Our experts can help.
1-888-WILLOW-3
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.
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- The right-size flange optimizes latch and suction for more pumping success
- Available in three sizes: choose from 27 mm, 24 mm, or 21 mm based on your nipple measurement
- Compatible with silicone sizing inserts (24 mm only) for a more snug and comfortable fit
- Dishwasher-safe containers for easy clean-up (made without BPA, too)
2 Willow 360 Flanges
You can shop all Willow 360 accessories here.
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Replacing Your Parts
For optimal output, replace every 90 days (or when you notice discomfort or signs of wear).
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View all- tonya a.Verified BuyerI recommend this productRated 4 out of 5 stars52 minutes agoComfortable
I haven't started using my pump yet but I put this piece in and it is really comfortable! I feel more confident this pregnancy about pumping than I did my last pregnancy.
Was this helpful? - Diana B.Verified BuyerI recommend this productRated 5 out of 5 stars1 week agoPerfect
Perfect for when I am on the go
Was this helpful? - Yolanda A.Verified BuyerI recommend this productRated 5 out of 5 stars1 month agoFor women with bigger nipples
I measured more than a 27 but I really wanted to use willow I got this size and it works perfectly I love them they aren’t uncomfortable they are good I’m so happy I’m able to use willow
Was this helpful? - Veronica R.Verified BuyerI recommend this productRated 4 out of 5 stars1 month agonice to have an extra set
easy to clean
Was this helpful? - RebeccaI recommend this productRated 5 out of 5 stars1 month ago5 Stars
Great fit with my 3.0
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