The warranty covers defects in materials and craftsmanship. The warranty does not cover normal wear and tear and does not cover damage caused by handling the product outside of normal use. Some cases (eg. leather, patent, Swarovski) are hand made and will require more care due to the nature of their materials. Although their cases are drop-test certified to protect your phone, damages incurred to your case from impacts and scratches will not be covered under warranty. You can read more about the warranty information here.