When you are just starting out in foiling, or when you want to progress, it can be difficult to know which foil to choose. Low Aspect, Mid Aspect, High Aspect: what are the differences and which foil to choose according to your level or practice? We explain it all to you.

The Foil has revolutionised board sports. It allows to fly over the swell, to move from one wave to another, partially or totally out of the water. It is accessible to all sizes, all levels, all conditions… Whether it’s a wing, kite, surf or SUP board… Here are all the criteria to consider when deciding between a Low Aspect or High Aspect wing.


First of all, you should know that the choice of your fin type will depend on your practice and your objectives. Nevertheless, you should consider other factors that influence the speed of the foil: the weight of the rider, the board but also the conditions, the power of the swell… It is important to first understand how a foil works. We have produced an article entirely dedicated to this subject(available in our News&Tutos section), but we will remind you of the essential information.

Like an underwater plane, the Foil moves underwater thanks to its speed and hydrodynamic lift force (upward lift) which lifts the rider onto its support. The Foil consists of a mastIt consists ofa fuselage, a front wing and a back wing (the stabiliser). The wings are more or less parallel to the board, which allows you to act on your foil by simply pressing your feet. The front fin has a domed upper part and a flatter lower part. This difference in shape and profile thickness created lift. The chord is the width of the wing (from the centre of the leading edge to the centre of the trailing edge) and the span is the length (the right/left end) of the wing, similar to the principle used in aviation.

Aspect Ratio Calculation

To calculate our aspect ratios, we use the following formula: span squared/load-bearing area. This formula takes into account chord variations throughout the shape of the wing, as opposed to the often used formula = span/chord. The latter only works if your wing has a rectangle shape and no chord variation. (In other words, it lacks precision).

Lengthening is not everything either. The parameters are almost infinite: angle of the tips, size of the winglets, variation of the relative thickness of the profile all along the leading edge… Each foil is therefore unique. Our philosophy is to start from your needs and offer you a product that perfectly meets them. But also while remaining versatile, rather than forcing the rider to adapt to his equipment. Please feel free to give us feedback and share your experiences on the Sroka Sessions Facebook group. We design these foils for you and to share this passion.



The lift of the foil will vary according to the shape of the front fin: size, thickness, profile shape and angle of incidence. With the same profile :
The larger the surface area of a wing with thickness, the more lift it generates but the more it slows down the wing. The higher the angle of incidence, the more lift it generates but the more it will slow down the foil.
On the other hand, the lower these parameters are, the lower the lift and the faster you go. (Please note that the surface area should not be included as the only reference parameter to know if the Foil carries much or not).


While a short-span foil is more manoeuvrable than a longer-span foil, this is not the only parameter that affects its handling.
The lateral curve (camber) of the front fin will be the major element for handling. The higher it is, the more manoeuvrable your foil will be and the easier it will be to turn. However, you will be slower because the total surface area will be larger and will slow you down. Conversely, a flatter side curve will turn a little less but will be faster.


The more lift your foil has, the slower and more stable it will be. This is due to the large surface area and thickness of the front wing, but also to the surface area and power of the stabiliser (the back wing) whose lift is the opposite of that of the front wing. This creates opposing forces to stabilise the entire foil. Lateral stability is also defined by the wingspan of the foil.


The surface area, fin profile, outline and angle of incidence of the front fin will influence the speed of the foil. A front fin with a small surface area and/or thickness will offer more speed, just as a front fin with a low incidence angle will be faster. Furthermore, for the same overall surface area, the larger the wingspan and the smaller the rope, the more speed you will gain by reducing the drag.



For our part, we do not do Low Aspect, all the classic range is in Middle Aspect. With its wider chord and medium span, this wing offers an excellent compromise between lift, stability and handling. Ideal for fun in the waves while manoeuvring, its slightly higher thickness than the High Aspect will reduce speed (compared to the High Aspect) and brake you more but less than a Low Aspect.

Foil Sroka Freeride


Its longer wingspan and shorter chord are similar to those of a glider. Like an aeroplane, the High Aspect will glide with speed, and be more efficient. Indeed, you will not need to pummel with effort to gain power. The sailing will still be more technical and the handling less than that of a Low Aspect or Mid Aspect foil. For example: the 1190 S has the same wingspan as the 1500 Classic.

Foil for Surf High Aspect


First of all, you can do everything with the different models, but the feeling and navigation will be different. In addition, you can start with one wing, although we recommend the mid aspect for the Wing Foil and not the High Aspect, and then move on to another. Nowadays, foils are very modular, so you won’t have to change all your equipment (and progress without breaking your piggy bank).

Wing Foil: beginners will prefer Medium Aspect or Low Aspect models with a fast start in light winds. A High Aspect fin will be intended for experts. They are also suitable for medium to strong wind conditions, very fast, with excellent control and stability at high speeds. Super easy, you can pummel effortlessly. If you are looking for a fin that is easy to use but has good performance, we recommend the Medium Aspect. We also ensure that our profiles are effective and scalable. You won’t end up with a flanged fin from the start.

SUP Foil: The High Aspect will allow you to be fast in powerful waves with a very good lift and a super efficient pumping to connect from wave to wave. The Medium Aspect will be easier to carve and start with.

Kite Foil: If you want to kitefoil with the S-Foil, we recommend the High Aspect without hesitation, combining speed, stability and feeling.

Surf Foil: the High Aspect will allow you toCatch big waves and keep your speed with the least effort. The Medium Aspect will carry you more, so will be slower but will allow you to have more manoeuvrability.

Wind Foil: a Medium Aspect fin will be excellent for freeriding and in light winds. The High Aspect will give you speed with control.

Wake Foil: The High Aspect will be perfect for gliding long distances, with fast starts and stable, efficient pumping. This model will be easier to start with (as it is more reassuring). The Medium Aspect will allow you to carve, jumper according to your desires.


At SROKA Company we offer several fundamentally different models and sizes of front wings.


First of all, our classic wings are similar to a Mid Aspect, in that they have a wider surface and less span. This allows them to be very manoeuvrable with a lot of tolerance in curves.

explanations of the difference between a Mid Aspect, Low Aspect and High Aspect foil

  • The S-Foil Classique 2000(XXL) front wing: Suitable for the largest sizes to start WingFoil and take off very early in the light wind with maximum lift and stability. In addition, more experienced riders will benefit from the Mid Aspect ratio which prevents this wing from saturating as quickly as a wing with the same surface area but with a less efficient profile and aspect ratio.
  • The S-Foil Classic 1750 (XL) front wing: This is the 4X4 wing from SROKA. It is used in all our packs. Perfect for the average person who wants to start WingFoil, it will make you take off immediately and evolve quickly. It will adapt to the practice of SUPFoil, to the initiation of SurfFoil in small waves not very powerful.
  • The S-Foil Classique 1500 (L) front wing: Lightweight riders can use this wing for beginners. Easy and versatile, it is the ideal compromise between stability, lift and glide, whether in WingFoil, WakeFoil, SurfFoil or SUPFoil.
  • The S-Foil Classic 1250 (M) front fin: This fin is designed for the more experienced rider. Whether in SurfFoil, KiteFoil, WingFoil, Windfoil or SUPFoil, it will combine speed and manoeuvrability to give you the best carving and gliding sensations.

Foil low aspect high aspect - What to choose


The SROKA High Aspect wings have a large span, a lower camber and a reduced chord. Therefore, they glide and carry better, with speed, but are more technical. They require more control in curves and manoeuvres because of their large wingspan.

Hight Aspect front wing foil

  • The High Aspect 1190 S (speed) front fin: predestined for WingFoil, it can also be used for SurfFoil in powerful swell trains as well as for KiteFoil and Windfoil. Its speed profile will provide you with exceptional speed and glide sensations with efficient pumping. In comparison, the HA 1190 S has a thinner, less load-bearing profile but is 20% faster than the HA 1190 L.
  • The High Aspect 1190 L (Lift) front fin:will be perfect to evolve and take your surfing to the next level in SurfFoil, SUPFoil, WakeFoil. More lift than the HA 1190 S(20% more lift), this fin will require no effort when pumping and connecting waves. foil comparator