We've incorporated everything we have learnt so far, including feedback from our users to make the best even better! How tight you wear the band is based on personal preference. Some people like to wear it loose and able to move, some like it to fit snugly and not move during sports. Measure around your wrist using a piece of string or tape measure then purchase the closest size to your actual wrist size. If you like a loose fit, select the next larger size than the actual measurement. Make sure you have the correct size as per our sizing guide. Wear your Ionic Balance Band on whichever wrist you feel comfortable with. The band is waterproof so it can be worn during bathing, swimming and sporting activities. If you have any questions please do not hesitate to contact us.