If you're considering a memory foam mattress topper, you may wonder if you need to flip it over. The answer is generally no - most memory foam mattress toppers are designed to be used on one side only. However, there are a few exceptions. Some people find that their memory foam topper feels too firm when first used, and flipping it over can help soften it up. Additionally, some memory foam toppers have different firmness levels on each side, so you may want to convert it depending on your preference.