polyurethane foam and an inner lining 126 of washable plastic the sidewall 114 bottom 116 and lid 118 are sewn and secured together at seams 128 the sidewall 114 includes the ice sheets 120 which are deployed along the interior surfaces 115 of the sidewall the ice sheets 120 are held within pockets 130 formed by a set of sidewall liner 132 which are secured to the sidewall 114 by the seams 134 sewn to the sidewall layers along their perimeter edges 135 and along the spaces 137 in between the ice sheets 120 the sidewall liner 132 is preferably transparent so that the refrigerant cubes 136 are visible and the visually pleasing cooling appearance of the inside of the cooler afforded by the cubes is maintained referring now to fig1 the cooler sidewall 114 is constructed of several layers including a tough fabric shell 112 a thermal insulation layer 124 an inner plastic lining 126 ice sheets 120 and sidewall liners 132 the ice sheets 120 include a backing layer 121 and a top layer 123 of polyethylene film formed to define compartments for the refrigerant cubes 136 the sidewall liners 132 are attached to the interior lining 126 and insulation layer 124 at the seams 134 and define the pockets 130 the seams 134 comprise thread sewn through the sidewall liners 130 the interior lining 116 and the insulation layer 114 the.