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The double air insulation is made of aluminum foil and polyethylene. The aluminum film on the surface can directly reflect ultraviolet rays and heat. In radiology, the double bubble sign is a feature of pediatric imaging seen on radiographs or prenatal ultrasound in which two air filled bubbles are seen in the abdomen, representing two discontiguous loops of bowel in a proximal, or 'high,' small bowel obstruction.
| Materials | Air Bubble |
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