The design creates more pressure points across the entire length of the blade for streak-free wiping. The flat blade design eliminates snow and ice build-up, and is heat and ozone resistant. The silicone rubber continually reapplies an active silicone coating on the windshield, that promotes water beading and quiet operation.
Excellent wiper blades at a great price and I shopped around. I have these silicone blades on a couple of my other cars and I like them because I don't have to swap them out as much due to the fact they last longer. Other rubber blades may cost as much but are not worth it... been through my share of Bosh and Rain-ex blades. PIAA seems to be pushing a better quality product for now.