Buff Labs’ screen protectors will keep your iPhone’s display intact if you crush almonds with a hammer on it. The secret to their Tonka-toughness is that each protector is composed of four layers including a “shock-absorptive cushioning layer” on top, which absorbs most of the energy from an impact. They also use a silicon adhesive layer which makes it easy to remove and re-position, and also helps to release any bubbles trapped during installation.Buff Labs appears to be based in Japan, or South Korea, but it doesn’t look like they sell them directly from their website.”]
Source: https://gizmodo.com/watch-this-iphone-screen-protector-shrug-off-a-hammer-b-5903121