Poron XRD is the shock-absorbent foam material used in G-Form's cases, and Incase is now using it as well. Among the cases to feature it is Systm Chisel for iPhone 5 ($35). The protector combines a hard plastic outer shell with a non-removable rubber layer inside, and is partially exposed through the back. This rubber layer includes button protection, while leaving the ports open. Incase uses the Poron XRD to line the entire back panel of the case,…
