- Fit into our 24 mm flanges to improve comfort and output for moms who measure smaller than 21 mm
- Flexible silicone material provides a snug, secure fit
- Compatible with Willow 360, Willow 3.0, and Willow Go flanges
- Dishwasher safe for easy clean-up
- Made without BPA for a safer pumping experience
Use the Willow Size Guide to measure nipples and find the insert size that's right for you.
*Please note sizing inserts can fit into 24mm flanges or containers only.