OtterBox Defender iPhone 6 Cases are very thick and sturdy. so in the matter of protection, They are one of best options.

But if you are seeking a lightweight and slim layout, this option may not suitable for you.

Amazon.com  OtterBox iPhone 6 Case - Defender Series, Frustration-Free Packaging - Moroccan Sky (4.7 inch)  Cell Phones & Accessories (7)