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2. Wheelchair cushion - Wikipedia

   en.wikipedia.org/wiki/Wheelchair_cushion

   Wheelchair cushions are cushions specifically designed to provide comfort and protection against injury for wheelchair users. They also aid in properly positioning the user in the correct posture. Wheelchair users are at great risk for pressure sores. [1] A number of factors are included in the formation of these ulcers including:

3. Memory foam - Wikipedia

   en.wikipedia.org/wiki/Memory_foam

   A memory foam mattress is usually denser than other foam mattresses, making it both more supportive and heavier. Memory foam mattresses are often sold for higher prices than traditional mattresses. Memory foam used in mattresses is commonly manufactured in densities ranging from less than 24kg/m 3 (1.5 lb/ft 3) to 128kg/m 3 (8 lb/ft 3) density

4. Foam rubber - Wikipedia

   en.wikipedia.org/wiki/Foam_rubber

   Foam rubber yoga mat. Foam rubber (also known as cellular rubber, sponge rubber, or expanded rubber) is rubber that has been made with a foaming agent so that its structure is an air-filled matrix. Commercial foam rubber is generally made of synthetic rubber, natural latex, or polyurethane. Latex foam rubber, used in mattresses, is well known ...

5. International DuraStar - Wikipedia

   en.wikipedia.org/wiki/International_DuraStar

   The International DuraStar line, known as the 4000 series prior to 2008, is a line of medium-duty trucks produced by Navistar International from 2001 until 2018. [1] Introduced as the successor to the International 4000 series of 1989–2001, the 4000 series was renamed the DuraStar in 2008.