Vissla Congos 16.5" EcolasticGet Lost in the Congos. Our Ecolastic boardshorts feature an easy access elastic waist and 4 way stretch fabrication, for all day comfort and mobility. Measuring 16. 5 on the outseam, the Congos are manufactured from a sustainable blend of recycled polyester, cotton, and hemp fibers. Styling includes a caliper scalloped hem back pocket and integrated key rope, as well as on seam pockets. Made for all day surf, swim, lounge, and more importantly, fun.