Presidio SPORT cases have a grippy silicone exterior, a polycarbonate outer shell, and inner IMPACTIUM lining for three layers of protection in a one-piece case. Microban anti-microbial technology protects your phone against hostile bacteria growth that causes odors and stains. 360-degree port protection for port and button covers and a mute switch dial protect while keeping them accessible. No-slip silicone exterior – IMPACTIUM Sport provides a no-slip grip, even when your hands are sweaty. 12-foot drop tested with IMPACTIUM Shock Barrier – Ridges of IMPACTIUM material on the inside perimeter of this Presidio case compress on impact to absorb and disperse shock.