A Bolster on a Flat Perch that is sandwiched between the pillow top sheet and the pillows for support. These are used for birds with feet or skeletal problems. For birds with splayed legs it can be put in the middle of the pillow top sheet so your bird can straddle it. If your bird favors one side it can be placed on that side so the bird can rest on the bolster.
Make sure when placing the bolster it in the pillowtop sheet, you put the ties on the inside so as not to get the birds feet caught in the ties.