Yes, the sensor for the FreeStyle Libre can stay attached for up to 14 days. However, exposure to water, such as in a pool, can reduce the adhesive power of the protective coverings over time. It is recommended to use a small protective covering under the sensor and a larger one over it when swimming. Additionally, there are waterproof shower covers available that can protect the sensor area while allowing for movement. These products can usually be found online for purchase.