The Zowie S1 introduced a high-profile symmetrical shape that filled the gap between the low-sitting FK and the tall ergonomic EC in Zowie's lineup. At 87 grams wired with the PMW3360 sensor, the S1's distinctive high rear hump provides aggressive back support during claw grip that neither the FK nor EC shapes offer. The S series was designed in direct response to professional player feedback requesting a symmetrical mouse with more palm contact. The S1's medium-large size targets players with average to large hands who want symmetrical shape with pronounced rear support. It proved that there was significant demand for a third shape archetype beyond flat ambidextrous and ergonomic right-hand designs.