Unfortunately, it’s not a 1:1 swap. Because the materials and shapes are different, they interact with your pelvic floor differently. While Impressa offered 3 sizes, Uresta offers 5 sizes, giving you a higher likelihood of finding your perfect level of support. We always recommend new Uresta users try the Starter Kit, which includes the 3 most common sizes which fit ~90% of women. If you need either a larger or smaller size, we can send you one for free within the first 30 days. For more information on how Uresta compares to Impressa, check out the link below.