Halo Chest Seals ™ dupack is a hydrogel occlusive chest cover without flaps, having an oval  face. The package contains two pieces of these highly adhesive chest covers  with dimensions 14 x 21 cm. For easier application, each piece is Halo  Chest Seals ™ equipped with a wide non-adhesive surface, which makes the chest cover easier to grasp and place in the desired place.