Yes - you can take them in the bath or swimming with care, for up to 30 minutes.
Both the sensor (glucose monitor) and the Limbo transmitter are dust and waterproof, so you can can wear them in the shower or in the pool. They’re rated IP67, which means they will cope under up to a metre of water for up to 30 minutes.
Drying
Be careful when drying yourself because the adhesive is less effective when wet. If you notice strange readings after towelling dry, there's a chance you may have knocked the sensor a little too hard.
Don't use a hairdryer to dry the patch because the air comes out at hotter than the sensor's safe operating limit of 45 degrees celsius.