The Real Science of Cold: Why Closed-Cell Foam Works Better
Why Closed-Cell Foam Keeps Ice Longer — The Real Cooling Science Behind Fish Bags
Ever wonder why some fish bags keep ice all day, while others are already leaking water by noon? The secret isn’t just the outer fabric — it’s the insulation inside.
What Is Closed-Cell Foam?
Closed-cell foam is a type of insulation where each air bubble is completely sealed. This structure prevents air and water from passing through, which means better temperature control, no water absorption, and strong support for ice and fish weight.
We use 1/2 inch closed-cell foam in our fish cooler bags to maximize ice retention and durability.
Real Ice Test: 35 lbs of Ice at 100°F
To test performance, we placed 35 lbs of ice inside the flat-bottom cooler and kept it in a controlled chamber at 100°F (37°C).
Results:
- Ice stayed solid for up to 36 hours
- No soaking or water absorption from the foam
- Dry ice can be used for air travel or long-distance transport
Why It Works Better Than Regular Foam
| Feature | Closed-Cell Foam | Open-Cell / Cheap Foam |
|---|---|---|
| Water Absorption | Does not absorb water | Absorbs and becomes heavy |
| Ice Retention | Holds ice cold longer | Melts ice faster |
| Odor | No smell | Can trap odor and bacteria |
| Dry Ice Safe | Yes | Often not recommended |
Lightweight, No Odor, Easy to Clean
Closed-cell insulation keeps the cooler bag light to carry even after hours on the water. It doesn’t trap smells, dries quickly, and the waterproof coated outer fabric wipes clean with soap and water.
From Dawn to Dock — Performance You Can Feel
Whether you're fishing, trolling offshore, or keeping drinks cold on a boat, this insulation keeps your catch firm and your ice frozen longer. Reliable. Simple. Built for the water.
