Thank you for contacting Product Support. No it is only made to hold one 12X13 insert at one time. You should order two inserts so that when you are using one the other can be getting cold in your freezer and will be ready when the one in your wrap gets warm.
1 Being overweight: Excess body mass can decrease blood circulation, causing fluid to build up in the feet, legs, and ankles.  Standing or sitting for long periods: When the muscles are inactive, they canât pump body fluids back up toward the heart. The retention of water and blood can cause swelling in the legs.
What causes Swollen Ankles and feet? Swollen Ankles causes may include : Heart Disease. In many patients with swollen ankles heart disease is found to be a cause. Swelling in the ankles can be an indicator of heart ailments. Liver Disease. In a few cases of Swollen Ankles liver disease may be the underlying cause. Ankle swelling can be a symptom of liver ailments. Drugs