Use our ergonomic solid foam wedges to get lumbar support when sitting anywhere: in a chair, in your car, at the office, on the bus, or in a rocket ship! This product is generally used for a wedge behind your back while sitting and not to sit on. Helps reduce back pain while seated by keeping your body in the correct ergonomic position. Small and large sizes available so you can use them anywhere. Triangle shape offers maximum comfort. Product Dimensions: Small = 12 x 11 x 3 to 1 taper / Large = 15 x 11 x 3 to 1 taper Great for high back and lower back positions. You can also use this as a side pillow. This product is highly versatile. Restore your core and relieve pain today with our therapeutic firm grey back cushions. This wedge is cut from our charcoal firm foam and is open cell foam. The foam is very firm for an open cell foam but is not as firm as closed cell foam products.