Skip to main content

Willow Sizing Insert Set (2-pack)

Regular price $19.99
Unit price
per 
Our silicone sizing inserts help to optimize output for moms who measure smaller than 21 mm
4.0 (311)

Flash sale! Take 25% off with code DEC25

Insurance & HSA/FSA

FSA/HSA reimbursements eligible

2 ways to pays with

Learn more about payment options

Free shipping on all orders over $69

US-Based Customer Care

Replacing Your Parts

For optimal output, replace every 90 days (or when you notice discomfort or signs of wear).

Frequently Asked Questions

Total 5 star reviews: 232 Total 4 star reviews: 25 Total 3 star reviews: 26 Total 2 star reviews: 13 Total 1 star reviews: 42
4.2
Rated 4.2 out of 5 stars
Based on 338 reviews
Slide 1 selected
338 reviews
  • Vanessa F.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    4 days ago
    Helped increase my output

    At first wasn’t sure if it was the pump after using the insert my output changed immensely. Use the sizing kit and sometimes I alternate between 2 diff sizes of inserts depending on how full I am 🙂

  • Diana J.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    6 days ago
    Perfect Fit

    The Willow sizing inserts are great. The fit is snug and comfortable.

  • Amanda W.
    Verified Buyer
    I do not recommend this product
    Rated 1 out of 5 stars
    1 week ago
    Hurts

    I’ve tried two inserts and the pump hurts.

    WP Profile picture for Willow Pump
    Willow Pump
    5 days ago

    Hi, Amanda! Thank you for taking the time to share your review of our Sizing Inserts!
    Sizing always matters! Pumping should not be painful & when we are tense, nervous or in pain, the volume we pump can be reduced. We have learned with time, that Moms have more comfort and success by measuring and reducing the flange size to fit their individual anatomy. Flange sizing inserts help us achieve that ideal fit for you, which can make all the difference in your overall experience with your Willow pump. So, getting comfortable (in the correct sizing) leads to a great pumping session and better overall experience. For Willow 360™, we recommend using your exact sizing to match the measurement of each side. For Willow Go®, we recommend adding 1-3mm to your measurement for an ideal starting point.
    If you would like further sizing assistance, please feel free to check out our Mom Coach services here: https://help.onewillow.com/s/sizing, we'd love to help!

  • Michelle S.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    1 week ago
    Comfort for small sizes

    These provide more comfort while pumping and have a small size that works for me. (Also fit in spectra)

  • Kelli M.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    1 week ago
    Increase output

    Fit great and so comfy! So important to have the right size flange

Reviews LoadedReviews Added