Ballistic is shipping the latest in its rugged protection for the iPhone 4: the Ballistic Lifestyle (LS). It’s made of TPU material and silicone Ballistic Corners.

This case apart sports interchangeable corner bumpers, designed by Ballistic to have different thickness options. This allows for Ballistic customers to customize the amount of shock absorption, says Adam Stubin, vice president of Business Development, Ballistic.

The Ballistic LS is now available for US$29.99 in translucent smoke and translucent blue, at . Each color includes one set of standard black bumpers and one set of large red bumpers for extra protection.