1. It is made of PC + paste skin, and the inside of the shell is put velvet 2. It adequately protects devices from the normal scratches, dirt, tear and wear 3. Thermal sensor discoloration design is good, the color changes as the temperature gets higher 4. Simple, comfortable, easy to carry 5. All buttons and ports are easy to access

http://olla.gr/for-huawei-p40-paste-skin-pc-thermal-sensor-discoloration-protective-back-cover-case-black-to-green/