Relief Pak® ColdSpot™ Cold Pack, 11 x 21 Inch, 1 Each Mattress Overlays Toppers Optimum Comfort Gel Cushion (24 The unfolded towel measures Optimum Comfort Gel Cushion (24 x 18 ) * Unique channeled gel bladder prevents gel migration in high pressure areas * Gel channels provide relief over the entire cushion area * Foam base provides additional support * Inner foam core has a liner to protect the integrity of the foam * High end cover with straps Specially threaded twist on cap prevents loss of specimen minimizing chances of leakage Pack can be chilled in a chilling unit or freezer but should be wrapped in towel before applying to treatment area Urethane clay cold pack is 11 x 21 inches