Dome-shaped tents Dome-shaped tents consist of two poles of equal length which intersect at the highest point and create a squareshaped ground surface area. SALEWA was the first company to bring a so-called igloo tent onto the market, and in 2006 the SALEWA Sierra Leone will celebrate its 30th anniversary! Revolutionary at the time was the fact that the tents could stand up without guy lines, which in the mountains especially, where the ground is rocky, was a huge advantage. Depending on the tent’s features, up to two entrances can be created and different-sized canopies incorporated with very little effort. The walls are relatively steep, and the inner tent has a spacious feel to it. Two entrances ensure good ventilation inside the tents. Tunnel tents Of all the different tent shapes, tunnel tents are the ones in which space is utilized best i.e. tunnel tents are relatively light compared to their size. Between two and any number of poles can be used to form the tent. They are bent into arches and aligned parallel to each other Normally two to four poles are used. Tunnel tents that have their narrow sides facing the wind are very stable; only if there is a very strong side wide do any problems arise. In such cases, tunnel tents need to be guyed using all available lines. This works very well, and is also partly the reason why tunnel tents are chosen for expeditions. In alpine environments tunnel tents are somewhat at a disadvantage as they must always be guyed. Geodesic tents Geodesic tents are complicated to pitch, but on the other hand are the most stable. The numerous poles intersect at various points, with the number of intersection points having to be higher than the number of poles used if the tent is to be a “pure” geodesic tent. Tent pitchers aim to end up with a (hemi-)spherical shape, which in nature is the most stable shape. It can withstand the highest wind speeds and heavy snow loads and remains stable even on poor subsoil. Geodesic tents are therefore the first choice for all extreme expeditions. Pitching with two people is quicker and easier and the poles are not subjected to excessive strain.