The Dash can be used for swimming on a daily basis. Some pools do have a high concentration of chlorine and other chemicals that could damage the plastic and silicone. To achieve the complete comfort and secure fit, we used a 94% ergonomic model. That means that 94% of all people will have a secure fit. Beyond that, we have no cable tugging at the headphone, and the center of mass is inside the ear. The Dash will always touch 3 points in the ear, if the right size sleeve is chosen, to prevent the headphone from slipping out of the ear.