The Croakies ARC Eyewear Retainer System is the lightweight & waterproof foundation of the ARC family.  These Croakies have two pair of interchangeable Plug 'n Play ends made to fith a variety of frames and the retainer cable of this Arc System rotates to keep the cord angled away from neck.  For days by the water, attach a Float Kit so you don't lose your beloved Smiths or Maui Jims.