How to protect iPhone screen from cracking without a huge case?

So I already know what cases I want to get for my iphone, and they aren't meant for protection, but I want to protect my screen from cracking, so are there other ways to do that?

I think metal case is most protective and slim.
like this

You can buy a screen protector or get a iphone case with screen protector, following is my recommendation. Hope it'll help you.

A slim and durable case will solve all your problem, especially this Bumper Frame iphone case with Front/Back Sticker. I have used it for a long time, it's really practical.
Here i find a link for you.
http://www.case2case.net/tunewear-poptune-bumper-frame-for-iphone-4s-4-with-front-back-sticker-skull-pink.html

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