If you are buying a new longboard, at some point you will come across this question. PU or EPS? What is the difference? Which one is better? The honest answer is: it depends on what you want from your board. But it is possible to be much more specific than that, and that is what this guide does.
In recent years, EPS has gained ground in the longboard market. Lighter, more durable in some aspects, with good buoyancy. But PU remains the material of choice for most serious shapers when it comes to feel and response. Understanding why each one is used makes all the difference when it comes to choosing.
What is a PU blank and how is it constructed?
PU is polyurethane. It is the material that has defined modern surfing since the 60s, when Clark Foam became the standard supplier of blanks for shapers all over the world. Before that, boards were made of wood. PU changed everything.
The PU blank is dense, with a closed-cell structure that offers natural flexibility throughout the entire board. This flexibility is what many people call the "feel" of PU: the board flexes slightly under pressure, absorbs wave irregularities, and responds in a smooth and predictable way.
Most PU longboards have wooden stringers inside the blank that run the length of the board. These stringers control the stiffness and flex distribution along the shape. At Lufi, stringers vary by model: basswood for a livelier flex, cedar for more stiffness and durability.
Lamination over PU is usually done with 6oz Hexcel cloth, which offers strength without compromising the material's natural flex. The end result is a board that responds well in both small waves and stronger conditions.
What is an EPS blank and how is it constructed?
EPS is expanded polystyrene. It is the same principle as styrofoam, but in high-density versions developed specifically for surfing. EPS is significantly lighter than PU and has a different cell structure: the cells are closed, which makes the material naturally more resistant to water absorption.
The construction of an EPS board differs from PU in one important point: EPS on its own is brittle and lacks the flex needed for surfing. Therefore, the lamination plays a much more structural role than in PU. It is the fiberglass cloth and resin that give the EPS board its strength and final behavior.
There are two main types of resin used with EPS: epoxy resin and polyester resin. Epoxy resin is the most common with EPS because it adheres better to the material and delivers a lighter and stronger construction. Polyester resin, used in traditional PU, does not work well with EPS because it can dissolve the blank during lamination.
At Lufi, EPS models are laminated with 4oz or 6oz Hexcel cloth depending on the model, with biaxial glass on the deck in some shapes to increase resistance to foot pressure.
How does each material behave in the water?
This is the question that matters most in practice. And the answer involves some factors that go beyond simply "lighter" or "heavier."
Buoyancy and paddling
EPS floats more than PU for the same board volume. This means an EPS board with 70 liters will behave with more buoyancy than a PU one with the same 70 liters. When paddling, this translates into less effort to keep the board on the surface and catching waves more easily.
For beginners or those who surf small waves a lot, this difference is noticeable and welcome. For more experienced surfers, PU usually offers a more "connected" paddle, with the board cutting through the water more naturally.
Response and feel on the wave
This is the biggest difference between the two materials. PU has a natural flex that absorbs the variations of the wave progressively. When you step on the nose, the board yields slightly and responds. When you trim, the flex distributes pressure along the shape smoothly.
EPS is stiffer. The response is more immediate and direct. Some surfers describe it as "livelier," others as "less forgiving." For maneuvers that require precision, EPS can be an advantage. For the long-sliding, wave-connecting style that classic longboarding proposes, PU still has the edge for most surfers.
Performance in small waves
In small waves, EPS shines. The extra buoyancy makes the board plane more easily, which means more speed with less wave steepness. If you surf small, mushy conditions or beach breaks with little power, EPS will give you more performance.
PU also works very well in small waves, especially on boards with generous volume. The difference is that you will need a bit more steepness for the board to start sliding.
Performance in larger waves
In conditions with more power, PU shows its advantages. The material's density and natural flex make the board behave more predictably in faster, more powerful waves. PU "holds" better in situations where the board needs to work with the wave, not just plane over it.
EPS in larger waves tends to be more sensitive to surface variations. The stiffness that is an advantage in small waves can become a challenge when the wave has more chop and force.
Durability and maintenance
In terms of durability, both materials have different pros and cons.
PU is easier to repair. A ding or a break in PU can be fixed by any experienced ding repairer with polyester resin and fiberglass cloth. The repair becomes invisible and the structure returns close to its original state. That is why decades-old PU boards are still in circulation.
EPS is more resistant to water absorption when intact, but the repair is more delicate. Epoxy resin requires more care during application and the result can be more visible. Also, EPS reacts poorly to heat: never leave an EPS board inside a closed car in the sun, because the material can expand and deform the shape.
Another important difference: PU yellows over time, especially on boards with natural finishes or light pigments. EPS tends to hold its color longer, but may develop pressure dings on the deck more quickly depending on the surfer's weight and the lamination.
PU or EPS: which one to choose for your surfing?
Choose PU if:
- You want the classic longboard feel, smooth glide, and nose riding
- You surf in waves with more consistency and power
- You value handcrafted finishes, pigment options, and the board's aesthetics
- You want a board that is easier to repair in the long run
- You are looking for your main board, not a travel board
Choose EPS if:
- You want a lighter board to travel with or carry more easily
- You surf small waves a lot and want to make the most of every ripple
- You are a beginner and want a board that is more forgiving when paddling
- You need a second board for specific conditions
- You struggle with the weight of a traditional PU longboard
What the material cannot solve
It is worth clarifying: the material is an important factor, but not the only one. A bad shape in EPS is still a bad shape. A well-thought-out shape in PU will deliver more than a mediocre shape in any material.
What defines the quality of a longboard is the whole package: the shape, the stringers, the lamination, the fins, and the material. When all these elements are aligned with the surfing style of the person using the board, the result shows in the water.
How Lufi works with both materials
All Lufi longboards are hand-shaped by Lufi Bento, regardless of the material. Both PU and EPS models go through the same shaping process, with the same attention to outline, rocker, stringers, and finish.
PU models are laminated with 6oz Hexcel cloth and stringers selected by model. EPS models are laminated with 4oz or 6oz cloth with biaxial glass on the deck where necessary, ensuring structural stiffness without compromising weight.
The difference lies in what each material delivers under your feet. If you are still unsure about which one to choose, talk to us via WhatsApp. Based on your skill level, the type of waves you surf, and what you want to feel on the board, we will help you make the best decision.
