Used with your Reformer, a Sitting Box opens up a new realm of versatility, including prone and abdominal strength exercises, side stretching and more. It also offers a more comfortable option for seated exercises. Our three-handled design allows you to carry the box like a suitcase. Sitting Boxes are included with all wood Reformers.Comes with standard foam padding. 16-in.wide x 29-in.long x 11.5-in.high (41cm x 74cm x 29cm).