A swim mask having a buckle that slides in a curved groove in the mask frame. The buckle has a virtual pivot point that is much farther forward than any prior art swivel mask buckle. In fact, the virtual pivot point could be infinitely in front of the mask if the groove were straight. The embodiment shown has a pivot point that is slightly in front of the mask lens. The preferred embodiment is also extremely simple to manufacture and assemble. It also has a means for being easily locked into any of several positions by the user. It is also aesthetically pleasing and allows easy strap adjustment. The preferred embodiment also has a means to attach to the mask frame such that it is extremely secure and cannot be accidentally detached and it also has only three components per buckle.