How to know if this iPhone cover will protect my phone?

My dad got me a $10 Accellorize cover, but I can't find anything online about its reputation. I've seen friends drop their iPhones in covers from face-level and it not break, and I want a cover with that level. How much would I have to expect to pay? Name as many brands that are known for that level of protection (not necessarily waterproof or anything). Or will these $10 covers work too?

Will the more-effective brands feel heavy in my pocket?

$10? It would be cosmetic only. For reliable protection from drops, expect to pay $40 at a minimum.

I've had phones break in Otterbox Defenders; they're $55 where I live.

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