Hollow boards are significantly more stable than boards with a foam core. The stability comes from the construction and materials used in these boards. The shell of the board is made of rigid PVC foam that is only 3 to 6 mm thick and does not absorb any water because it has closed cells. This foam alone is so hard that it is almost impossible to make a small dent in it with your fingernail. Even a blow with a hammer leaves hardly any marks. In comparison you can make deep dents in XPS foam with your thumb. With EPS foam you can drill holes with just your finger. XPS and EPS foams are much less sturdy and EPS also absorbs a lot of water. The rigid PVC foam is laminated with carbon layers on both the outside and inside. This composite construction results in a very robust surface and a significantly stiffer board as a shell.

The impact resistance of rigid PVC foam sandwich is higher than that of honeycomb sandwich. Rigid PVC foam is tough and elastic, absorbing and distributing energy without breaking easily. It is ideal for absorbing localized impacts. In the event of a hard impact rigid PVC foam delaminates less quickly than honeycomb. Damage often remains localized. Under heavy localized stress the thin honeycomb core buckles (crushing effect) which can lead to structural failure.

If you do manage to puncture the board's hull while far from shore and the board fills with water there is no need to panic. The board's hull still provides enough buoyancy to prevent the board and foil from sinking to the ground of the water. The fact that it is very difficult to damage the shell of a hollow-construction board when wing foiling is the greatest safety feature. A board with an EPS foam core would be significantly heavier after such a crash while a hollow-construction board can be repaired to almost the same low weight.

If you take a hollow board out of a car that has been parked in direct sunlight and then throw it into really cold water, pressure equalization must take place because gas (air) expands or contracts when the temperature changes. Earlier hollow boards were unable to ensure this pressure equalization and therefore sometimes suffered structural damage if a valve was not opened manually. Today this is done by a Gore-Tex valve which has been installed in our boards on the deck at the rear of the board. This Gore-Tex valve never needs to be screwed in or out and you don't need to worry about it in any other way. If in exceptional cases condensation forms inside the board due to significant temperature changes and high humidity you can unscrew the separate drain valve on the rear of the board and drain the water. However this is never a large amount – about the size of a thimble.

The shape of the board may trick the eye into thinking that the board is much thicker than other boards and that you would therefore be further away from the foil. However this is not the case at all. It is clearly an optical illusion. The effect of the lateral steps only suggests a thicker board. In fact the board is NOT thicker than other boards. In the stance area the 83-liter board measures between 13.4 cm and 14.5 cm, and the 108-liter board between 14.5 cm and 15.8 cm. This means that both of my boards are even thinner than many other boards on the market. I measured some boards myself and did not rely on the information on their websites. The low thickness is achieved among other things by the concave shaped deck. The riding experience is always very important to me with my products which is why I don't want to have to ride a board on stilts. Incidentally the side steps create an interesting side effect. This means that the volume at the edges (rails) of the board is significantly smaller than on most other boards which are shaped with so-called “box rails,” i.e., more box-like edges. A large volume at the rails can cause the board to misalign during touch-downs which can often result in the rider crashing. No pure surfboard for waves is shaped with box rails in order to effectively prevent this misalignment. The rails are always kept quite slim and that's how the rails on my boards are shaped too. In addition to the keel in the underwater hull of my boards these slim rails ensure that touch-downs are hardly noticeable and you can just keep riding.