Willow Go® Flange Set (2-pack) Review: Sizing, Fit, and Comfort
By Willow: Wearable Breast Pump – Willow Pump | Published: 2026-08-20
Category: Product Reviews
Discover how the Willow Go® Flange Set (2-pack) improves pumping comfort. Learn correct sizing, fit tips, and why it's a must-have for wearable pump users.
Finding the right flange for your wearable breast pump can be a game-changer. If you're using the Willow Go® Pump, you know that a proper fit is essential for both comfort and milk output. In this review, we'll dive deep into the Willow Go® Flange Set (2-pack), exploring its design, sizing options, and how it enhances your pumping experience.

Whether you're a first-time pump user or a seasoned pro, understanding flange sizing and fit can prevent discomfort and maximize efficiency. Let's take a closer look at what makes this flange set stand out and why it might be the upgrade you need.
Why Flange Fit Matters for Wearable Pumps
Wearable breast pumps like the Willow Go® rely on a secure, comfortable seal to work effectively. A flange that's too small can cause friction and pain, while one that's too large may not create enough suction, leading to poor milk expression. The Willow Go® Flange Set (2-pack) is designed to address these issues, offering a range of sizes to accommodate different nipple dimensions.
Proper fit also impacts milk output. When the flange fits correctly, the pump can stimulate milk flow more efficiently, helping you express more milk in less time. This is especially important for busy moms who need to pump on the go. Investing in the right flange can make a noticeable difference in your daily routine.
- Measure your nipple size before ordering to ensure the best fit.
- A well-fitted flange should have a small gap between the nipple and the tunnel wall.
- If you experience pain or reduced output, consider trying a different flange size.
Unboxing and Design: What's Included
The Willow Go® Flange Set (2-pack) comes with two flanges, allowing you to have a spare or use them with multiple pumps. The flanges are made from soft, flexible silicone that conforms to your breast for a comfortable seal. They are designed to work seamlessly with the Willow Go® Pump and 7 oz Breast Milk Containers, ensuring a leak-free experience.

The design also incorporates a gentle curve that aligns with your body's natural shape, reducing pressure points. This thoughtful engineering helps prevent soreness during longer pumping sessions. Whether you're at home or traveling, these flanges offer the durability and flexibility you need.
- The set includes two flanges, perfect for replacing worn-out parts or having a backup.
- Soft silicone material adapts to your body for a personalized fit.
- Compatible with Willow Go® containers for a secure connection.
Sizing Options and How to Choose the Right Size
The Willow Go® Flange Set (2-pack) is available in multiple sizes, typically ranging from 21mm to 27mm. To find your perfect size, you can use the Breast Pump Sizing Kit, which provides measuring tools and guidance. Getting the right size is crucial for comfort and efficiency.
If you're between sizes, it's often recommended to size up slightly to avoid pinching. However, for a more precise fit, the Willow Sizing Insert Set (2-pack) can help adjust the flange tunnel to your exact measurements. These inserts are a great addition to your pumping toolkit, especially if your size changes over time.
- Use the Breast Pump Sizing Kit to measure your nipple diameter accurately.
- If you're between sizes, choose the larger flange to prevent friction.
- Consider the Willow Sizing Insert Set (2-pack) for fine-tuning your fit.
Comfort and Performance: Our Experience
We tested the Willow Go® Flange Set (2-pack) over several weeks, and the comfort level was impressive. The silicone material is gentle on sensitive skin, and the flange maintains its shape even after multiple washes. We noticed a significant reduction in nipple soreness compared to standard flanges.
Performance-wise, the flange set delivered consistent suction and helped maintain a steady milk flow. The secure seal meant no spills, even when we moved around. For moms who pump while working or caring for older children, this reliability is invaluable.
- The soft silicone reduces chafing and irritation.
- A secure seal prevents leaks, even with movement.
- Easy to clean and maintain, retaining shape after repeated use.
Comparing with Other Flange Options
While the Willow Go® Flange Set (2-pack) is a top choice, it's worth comparing with other options. The Willow Sync Flange Set 24mm (2-pack) offers a similar design but is specifically for the Willow Sync pump. If you use multiple Willow pumps, having the right flange for each is essential.
For those who prefer a more eco-friendly approach, the Catch-All Milk Cups can be used as collection containers during pumping, reducing waste. However, for direct pumping into bottles, the Willow Go® flange set paired with the Willow Go® Splashguard Container Set (2-pack) provides a complete solution.
- Consider your pump model when selecting flanges.
- Catch-All Milk Cups are great for collecting let-down or small amounts.
- The Splashguard Container Set adds convenience for travel.
Cleaning and Maintenance Tips
To ensure longevity and hygiene, clean the Willow Go® Flange Set (2-pack) after every use. Rinse with cool water to remove milk residue, then wash with warm soapy water or place in the dishwasher (top rack). Avoid using harsh chemicals or abrasive scrubbers that could damage the silicone.
Regularly inspect the flanges for signs of wear, such as cracks or discoloration. If you notice any damage, replace them promptly to maintain optimal performance. Having a spare set on hand is a smart idea, especially for busy moms.
- Wash immediately after use to prevent milk residue buildup.
- Use a gentle detergent and air-dry to preserve the silicone.
- Replace flanges every 3-6 months or if they show wear.
The Willow Go® Flange Set (2-pack) is a worthwhile investment for any Willow Go® pump user. Its thoughtful design, comfortable fit, and reliable performance make pumping easier and more enjoyable. Whether you're upgrading from standard flanges or need a replacement, this set delivers quality and convenience. Pair it with the Willow Go® Pump and 7 oz Breast Milk Containers for a complete pumping system that fits your lifestyle.



