MIL-STD-810H is a US military standard that outlines environmental testing procedures to assess the durability and performance of the phone cases under various environmental conditions.It helps ensure that the phone case is designed and tested to withstand the rigors of its intended operating environment, tested for durability, reliability, and overall performance.Our phone cases are tested for protection at 4 feet (1.22 metre)or 10 feet (3 metre) drops.