Most phone cases come down to three core materials: flexible TPU, rigid polycarbonate, and machined aluminum. Each behaves differently in a drop, on the wireless charger, and in your hand. Here is a straight comparison to help you choose.
TPU: flexible shock absorption
Thermoplastic polyurethane is a soft, rubbery plastic. It flexes on impact and absorbs energy, which makes it great at protecting corners from short drops. TPU grips well, resists yellowing better in higher grades, and stays slim, but on its own it offers less rigid structure than harder shells.
Polycarbonate: rigid structure
Polycarbonate (PC) is a hard, impact-resistant plastic. It holds a rigid shape, resists scratches, and spreads impact across a stiff shell. The best protective cases pair a PC back with TPU edges, combining a firm frame with cushioned corners for full-body drop defense.
Aluminum: premium metal armor
Machined aluminum frames feel premium, dissipate heat, and shrug off dents at the edges. They are the heaviest option and can affect signal or wireless charging if they fully enclose the back, which is why many metal cases use an open or frameless design with cutouts for the charging coil.
Which material should you choose?
For slim everyday carry, TPU or a TPU-PC hybrid is the sweet spot. For maximum drop protection, choose a layered polycarbonate and TPU rugged case. For looks, heat handling and a rigid metal edge, pick aluminum, ideally a frameless design so wireless charging still works.
Frequently asked questions
Does aluminum block signal? A full metal back can weaken cellular and wireless charging. Frameless or open-back aluminum cases leave the antenna zone and charging coil exposed to avoid interference.
Is TPU or polycarbonate better for drops? They work best together. TPU cushions impact energy while polycarbonate keeps the case rigid, so a hybrid meets standards like MIL-STD-810G more easily than either alone.
Which material yellows? Clear TPU can yellow over time from UV and oils. Higher-grade TPU and anti-yellowing coatings slow this significantly.
Need help choosing?
Compare materials across models in the Apple Cases collection, or contact the Gorilla Cases team through the Contact page or at 978-797-0223.