Remove the rear wheels by pressing the quick-release fasteners on the outer part of the axle. Particular attention should be paid when removing the seat cushion and storing it elsewhere. It must not be bent or pressed on one side. (especially if it is gel) 

It is worth knowing that  krzyżak is not always the best solution. Its disadvantage is the reduction of the rigidity of the stroller and the increase in weight. Therefore, in ultra-light active strollers you can often find a rigid frame. However, this does not mean that such a stroller cannot be called foldable. In active strollers, the frame is so small that after removing the wheels, it can be easily transported. Please also visit the manufacturer's websiteKushall.It offers a folding stroller with the stiffness and weight of an active stroller and a different folding mechanism.