Relief Pak ColdSpot Urethane Cold Pack General Purpose Oversize 28 X 53 cm / Clay Reusable - EachCold Pack Relief Pak ColdSpot Urethane General Purpose Oversize 11 X 21 Inch Urethane Clay Reusable Reusable and ideal for applying cold therapy to localized area Remains pliable and soft, even below freezing Made of durable heavy duty urethane exterior and bentonite clay interior, allowing it to hold its therapeutic temperature level for up to 30 minutes Pack can be chilled in a chilling unit or freezer but should be wrapped in towel before applying