Fitbit Inspire has taken a sophisticated and elegant approach in its use of form, color and proportion to create a life tracker that looks and feels like a piece of jewelry. The soft curves provide an optimal and a comfortable fit, especially for smaller wrists. Fitbit Inspire was designed with lightness in mind, to create a health tool that is easy to wear all day and night. The devices are made of a polymer blend which allows for the "dipped in color" look and lightweight feel. Unique molding techniques were used to bond the housing and the heart-rate monitor window into a unibody construction that is slim, sleek and swim-proof.