Get a piece of foam that's 46" by 7" by 10", medium softness, and medium density.
Trim all corners with an electric kitchen knife until they feel comfy. Make a
soft cloth cover, sew it onto your new bolster, and create a pillow case out of
two long pillow cases—adding a Velcro fastener on the open end. Change it occasionally.
The bolster is a lot longer than it needs to be, but I expect that you'll
also want a bolster for general side-lying-in-bed purposes, and this will
be perfect, since you can use it as a leg and arm rest simultaneously. Why make
a separate shorter one for computer use?
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