GS-D keeps your chain in place no matter how hard you hit the trails

Manufacturer item code: EBBMT500PA

Also no protection from gravel rash

but don't let the price fool you

Quadlock iPhone Bike Case - Black - 14 Heavy/Bulky GS-D keeps your chain inQuad Lock Cases feature their secure locking mechanism compatible with all twist, lock mounts, impact resistant edge to edge cover, and protective lining. With a tough, polycarbonate core and impact absorbing TPU edge to edge outer shell, you can be confident that your iPhone will be protected every day. The slim profile and soft touch material make it perfect for everyday use. Quad Lock MAG Cases are thinner and flatter with a customisable MAG Ring.