Our silicone flanges are very durable and should last a long time if cared for properly. When performance is good in the beginning and then starts to drop off, it's generally due to buildup of residue from milk or lubricant so that they feel slick.
We suggest a good thorough cleaning with a grease cutting dish soap like Dawn Original (yellow ducks on the label) to get them back to new condition. They should be crystal clear, and when dried, should feel "sticky" to the touch.
Reviewed by Diana West, IBCLC
June 10, 2021