What is foam core? A coach's in-depth explanation of how G4 Aerospace Foam Core revolutionized the industry
"What's the difference between the Six Zero Black Opal, which uses a foam core instead of a honeycomb core?"—This question has recently surged. In fact, starting in 2025, the pickleball industry is experiencing a movement that could be called a foam core revolution, rapidly changing the industry standard of "honeycomb core = normal."
As someone (Coach Yoshi) who has tested over 100 paddles, I will thoroughly dissect what foam cores are, how they differ from honeycomb cores, and which players they suit. I will also incorporate official technical information on the G4 Aerospace Solid Foam Core used in the Six Zero Black Opal, which should clarify your decision-making criteria.
What is a paddle's "core"? Let's start with the basics.
A paddle is broadly composed of three layers:
- Face — Materials such as Raw Carbon or fiberglass
- Core — The paddle's interior, dictating feel, rebound, and power
- Edge Guard — The protective trim around the perimeter
Of these, it's no exaggeration to say that the core determines over 70% of the feel. Even if the face material is Raw Carbon or fiberglass, the difference in the core creates an even greater distinction.
For many years, the standard in the pickleball industry was "core = polymer honeycomb." This material features a hexagonal, honeycomb-like structure that is lightweight and provides good rebound. It's a traditional structure also used in tennis rackets.
However, since around 2024-2025, paddles using a foam core—a high-density solid foam core instead of a honeycomb structure—have rapidly increased in popularity.
💡 Coach Yoshi's Take
Foam core itself is a material that has been used for some time in surfboard construction, motorcycle helmets, and aircraft interiors. What Six Zero has done is "optimize it for pickleball paddles," creating the G4 Aerospace Solid Foam Core. The material concept isn't new, but its application is innovative—this is the correct understanding of the current situation.
Honeycomb Core vs. Foam Core: Fundamental Structural Differences
Structural Differences
| Item | Polymer Honeycomb Core | Foam Core |
|---|---|---|
| Structure | Hexagonal hollow cells resembling a honeycomb | Solid layer filled with microscopic bubbles |
| Air Ratio | Approximately 70-80% (centered in hollows) | Approximately 20-40% (bubbles) |
