It comes with two pieces that fit together. At first, I was skeptical at this approach as I felt it would easily fall apart, making it nearly unusable. But I have never had it come apart thus far, and it's still easy to remove it in order to reach the battery, microSD or SIM card slot.
One of the best aspects of the Galaxy S hardware in my opinion is how lightweight all of the devices are. This case does its best not to add much bulk to the phone and it does a good job (it's only 1mm thin). The interior of the case boasts a felt lining that will work to protect the Captivate from wear and tear of the product.
To put it on your device, separate it into two pieces. Then slide them onto the phone with the bottom part fitting just underneath the top. Pick it up to ensure that it fits snuggly and you're good to go.
If you've been looking for a good case for the Captivate that doesn't add bulk, consider the Seidio Innocase II Surface, available from the Android Central store for $29.95. Find more pictures after the break.