The mat shapes itself around the object without perceptible pressure, gently encapsulating it without friction. The reusability of the mat makes it not only environmentally friendly but economical as well. The mat can be wrapped in a cotton cover, which is nicer against an object. The mats come in three sizes. Pamphlet Binders Scott Kellar at Northwestern University tells us that they have designed a simple, economical pamphlet binder with a company in Milwaukee.
Samples are available.
I first learned about the Wallmaster Drychem Sponge EA3601 from a colleague in England. These sponges are made of expanded pure latex for use in removing dirt and soot from fire-damaged surfaces. Originally they were chemically impregnated, hence the name. They are sold in blocks which can be cut into smaller shapes. They can be washed, but apparently after a while they begin to crumble.