Cushions are selected based on the condition and the wheelchair. In sports wheelchairs, most applicable are the Base or comfortable Elite seats and Comfortable backrest. They provide a comfortable seat in conjunction with a stabilising back adjusted to the deformation of the torso. Using a Stabilo backrest higher than the back of the wheelchair doesn't provide adequate stiffness, so then you need a supplementary seat back or headrest. In deep wheelchairs, most commonly a corset stabilising support is used to decrease the risk of extending the deformation of the torso. A supplement to this is the Comfortable Plus Duo, where, in addition, there is the option to correct the position of the pelvis and legs.