The F6 is specifically designed for arched benchers, to improve control and increase the potential for bigger benches! Allows the bar to be dropped lower on the chest. How the F6 Works: Like the Fury, the F6 sleeves are set at a 90 degree angle as you look down the length of the shirt. However, the big difference is in the angle of the sleeves as you look across the shirt. The sleeves on the F6 are set at a forward, tilted angle. As the lifter lies down on the bench and begins arching into position, the sleeves on the F6 tilt back to the optimum 90 degree angle in both planes - and only after the arched position is assumed. This design accomplishes: 1. A lower groove - the new sleeve allows the bar to drop straight to the optimal pressing point or "sweet spot" with less wandering of the bar. 2. Maximum stroke efficiency - A more efficient stroke is created since less energy is expended. 3. More Control - a lower groove and maximum stroke efficiency creates more stability and control. 4. Increased power - all of the above add up to the ability to redirect previously expended power to directly pressing the bar UP ! Unmatched, unsurpassed! 12 months blowout + 18 months "Run" guarantee (a major cause of blowouts).