Tech21 Impact Shell Case for Nokia Lumia 630/635 - Retail Packaging (Purple) Scientifically proven D3O impact material which absorbs and dissipates impact. An advanced TPU formula renowned for its excellent flexibility and abrasive resistance. A slim-fitting design with access to all functions of the device. Created with a high performance TPU formula known for its excellent flexibility and abrasive resistance Impact Shell case for the Nokia Lumia 630 / 635 offers premium impact protection for the device you love in a minimalistic, stylish design.