Jrc cocoon bivvy the jrc cocoon bivvy is a completely innovative design this shelter is a three rib pram hood style shelter with the 4th rib creating a peak it comes fully loaded with all the extras needed to fish comfortably featuring a heavy duty pvc groundsheet carry bag interlocking tension bars ultra light 6061 aerospace grade 16mm aluminium poles back air vents double pu coated 210 denier 10000mm hh oxford nylon 3 door option two huge side windows with mesh vents plus rod retain