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Material-wise, a high-quality FG protector is multi-layered, usually starting with shock absorbent silicon on the bottom layer, followed by PET film, and an optically clear adhesive to ‘sandwich’ the previous two layers with the next two, which are tempered glass and oleophobic coating. All of this scratch, oil, and shock protecting goodness is compressed into a <0.126mm-thick sheet that’s none heavier or otherwise obnoxious. A glass protector is superior to its alternatives in every way. It has better light transmittance, making for a clearer display. It’s anti-reflective and glare reducing. It has oleophobic coating, which heavily reduces fingerprints. It has the smooth feel of actual glass under your fingertips. shock protection. F-glass protectors boast a material hardness rating of 8H to 9H, meaning they are hard enough to resist scratches from anything that’s not topaz or corundum (extremely hard aluminum oxide).