Ideal for fitness swimming or training and regular swimming, this is the Speedo goggle is the second generation of the model, offering greater fit and easier adjustment.IQ Fit uses body scanning research to engineer products designed for real face and body contours. It is a brilliant, best-fitting, most comfortable, goggle technology. The unique seal profile fits the contours of the eye, ensuring leak resistance and a secure fit. As a result, significantly less strap tension than with standard goggles is needed, meaning they are comfortable length after length.Tensioning scale on straps allows easy adjustment every time, there is a double head strap for a secure fit and anti-fog for good vision and clarity underwater.