Their description:
Product Description
Never before has the flexibility and protection of a soft rubberized case been combined with the durability and scratch protection of a sleek hard shell in a seamless single-piece design… until now. CandyShell’s soft, colorful rubberized interior keeps your iPhone 3G or iPhone 3GS insulated from life’s bumps and knocks, while the shiny outer hard shell protects it from scratches and lets you slip it in and out of pockets easily. Full access to all ports and sensor… More >>
Go & get it here - i can recommend it:
Speck Products CandyShell Case for iPhone 3G, 3G S

I have had my speck case for my iphone for only one month, and it now cracked along the charger portion. The case also does not come off easily, which likely led to the cracking issue. The gummy rubber of the case attracts lint and does not look good after the first few weeks. I like to plug my iphone into a Bose speaker set at home, and a regular Aux in/out input does not fit with the case on the phone. I have to remove the case to use the Aux in/out connector.
I have try many iPhone 3gs cases, Switcheasy Neo, Switcheasy Rebel, Incase Slider, and this is by far is the best case I used.
I, as many others have indicated also, spent a lot of time looking for the right case. This quest mostly boils down to personal taste. I wanted a case that was well made, felt good in my hand, protected the iPhone, didn’t add a lot of bulk to the phone and would not detract from the natural look of my 3GS. The CandyShell by Speck Products fit that criteria perfectly. It is easy to install and remove the iPhone from the shell, it performs exactly as advertised and it fit all of my criteria.
I only rated the product 4 stars because, I have only had the product for a week and there is one very minor problem. As mentioned in other reviews, the switch Ring/Silent on the iPhone is tough to turn on while it is in the shell. A minor problem that is easily overcome by using a finger rather than a thumb. It is easy to get it up, ooh can I say that? Let me rephrase, it is easy to turn it of, it’s putting it in the on mode, by pushing the button down/away from you that is the problem. Otherwise it would have been a 5 star review.
Besides reading the reviews here you might consider going to the Speck Products web site and watch the video reviews and how to’s. It was very informative.
I purchased this product from TigerDirect through Amazon. It was delivered on time and in perfect condition.
I highly recommend that you consider purchasing this product.