You can wear the Fitbit One comfortably in or on your pocket or on a bra. The silicone clip will keep it secure.
If you wear your tracker on your waist, we recommend clipping it on your pocket facing inward for maximum security.
Use the sleep wristband to track your sleep when you go to bed.
You should keep your Fitbit One dry whenever possible. The Fitbit One is not waterproof, but it is rain, splash, and sweat proof. It should not be worn while swimming.