For all-day, take-anywhere protection of your iPhone 4/4S, the Lifeproof iPhone case makes a great choice. The case has a full IP-68 rating against water and dust, and is designed according to military specifications. It will guard against shocks and impacts to your phone, and remains fully sealed against water and dust particles.
You can even take the plunge underwater with your iPhone, as LifeProof keeps your device dry when you’re soaking wet. It’s rated to survive hour-long dunks up to 2 meters, w hile offering unsurpassed protection, the Lifeproof case itself only adds a scant 1/6" to your phone, so it won't add much bulk when you're carrying it around.
You can continue using the built-in camera on your iPhone as well -- the case has double AR-coated optical glass lenses for unprecedented crystal-clear photo and video quality. Plus, you can benefit from access to all phone features while it's inside the case.
Ingress Protection (IP-68) rating against water and dust
Tested to military specifications MIL-STD-810F-516.5 (2 meters/6.6ft drop on all surfaces and edges. 26 tests)
Sealed protection against minute dust particles
Ability to swim and take underwater (2 meters/6.6ft depth)
Ultra-slim; adds only 1/16" (1.5 mm) when measured from the center of the phone
Weighs less than an ounce (28 g)
Unique combination of materials that will not stick to your pocket
Double AR-coated optical glass lenses provide unprecedented crystal-clear photo and video quality
All phone features are operational while maintaining a high level of protection
Improves the bass and mid-frequency speaker response by utilizing the back of the case as a sub-woofer for a richer, fuller sound