It is the way all types thermal insulators work – a fur holds air between it hairs, wool between threads, a window between its glass panes. The air held in a hermetic space between vacuum flask’s walls or between window’s panes considerably slows the heat exchange between the layers.

Simplifying a bit it might be said that down is only a material used to fill and push away two layers of fabric which are meant to create something similar to a vacuum flask’s walls. The down is needed to keep the internal and external layers as far apart as it is possible. Obviously, the thicker the sleeping bag or a jacket is going to be the more down is needed. The optimal situation is when we succeed to come to a given thickness with the smallest amount of filling – that is why down is up to now the best known insulator (it is the most springy material for a given weight, more than even the most expensive fillings).

If we want to create and sustain the vacuum flask effect we have to construct a down product in such a way to keep the space between the internal and external layers of fabric as even as possible on a whole product surface. All layer junctions create so called thermal bridges. Popular down products are very often sewn through which causes that in some places e.g. a jacket does not insulate at all. Our products are never sewn through – apart from sweaters,   where it is not a flaw. In YET products the external and internal layers are connected by special tapes made of a very light nylon net. The down pushes the layers apart and the tapes keep them in an even distance. It is important to avoid cold spots also in collars, sleeves or hoods.

Very important for down products are suitable finishing touches-   You can find all details of the solutions used in our products here (przekierowanie do zdjęcia z opisem poszczególnych elementów wykończeniowych).