Silicone is a very common material used for iPhone cases. If you need to buy one, we will give you some suggestions of the most popular ones. Silicone is a light and soft fabric, so you don't have to carry much weight.

First we will show you a light colored case, the SwitchEasy Colors Pastel Silicone Case. This case has a light blue color, and it covers the sides and the back of the iPhone 4. It's light, flexible, and it protects against medium damage, but not water. You can get one right now for the price of $15, from amazon.com or Sears.

Then, we have the light pink Otterbox defender case. This is one of the more efficient silicone cases, because the silicone is only on the surface – the case is actually made of polycarbonate. It also comes with an included screen protector, and leaves all the jacks and camera lens uncovered for full and quick access to all functions. The case gets installed easily using a snap on system, and can be bought from the official site for $20 right now, on sale.

If you are one of the many Hello Kitty fans out there, you can easily buy the hot pink Hello Kitty Embossed Pink Flexa cover. This case is made of silicone, and has the well known Hello Kitty design printed. It's a slip on case, easily installed on your iPhone, and it fits kids as well as girls. The case protects from bumps, dust and fingerprints, and sells online for only $6 plus the shipping taxes, on the Amazon.com we site.

Or you can go for the funny looking and brown Case Mate Creatures Hoot Case. This cover would make a great gift for any iPhone 4 owner, and can be easily purchased from Amazon.com, for about $20.

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