A motion-activated venting system for incorporation into an article of apparel is described herein. The motion-activated venting system may comprise a variety of pleats having one or more folded edges and a ventilation region having a plurality of apertures. In a first state, the one or more folded edges overlie the ventilation region such that the plurality of apertures is covered. In a second state, the one or more folded edges are remote from the ventilation region such that the plurality of apertures is exposed. Further, in an intermediate state, the motion-activated venting system is partially open, thereby exposing a portion of the plurality of apertures.