Rocky C4 TrainerThe C4 Trainer is Rocky's lightest boot yet. The follow-up to its S2V combat boot, the C4 Trainer weighs in at just .94 pounds. Its light weight and athletic-shoe fit gives those in uniform extra oomph in the field. Rocky Airport footbed and an EVA/rubber lightweight outsole adds to the feather-like feel. Rocky rounds out the C4 Trainer line with a selection of oxfords and hikers.