Protect your iPhone 6 with this ultra thin, durable and easy to apply Cover-Up Crystal Clear Invisible Screen Protector. The high quality material protects against scratches, scuffs, dust, and fingerprints. It is very easy to apply and remove without leaving residue and is virtually undetectable once it's applied to your iPhone 6.
Also available in Anti-Glare Matte edition.
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This does what it says on the tin. It's a little tricky to apply but fine with some patience. The instructions are clear in any case.