I love my Shapeways case for my Dexcom G4 Continuous Glucose Monitor! It feels like hard but flexible plastic. It keeps it protected from accidental drops without bulking it up. Even with the case on, the unit slips easily into my pants pocket and other tight spots. The side opening allows charging so I never have to remove the case 24/7. A big improvement over the leatherette case Dexcom sends with the unit. I added a screen protector for the front and this protects the rest! Great product!