Bought this from my chiropractor. Tried it once but ended up not needing it. Has been sitting in cupboard since. It is clean as was only used once with pillow case on top. And it has a removable washable cover of its own also. Similar to item pictured (see spinal products website). Designed to keep your neck and spine in a more neutral position when sleeping. It has a ridge basically at one side that you put under your neck. It is a soft but supportive kind of memory foam and a soft cream velour cover.
Dimensions are 47 x 33 cm and height of pillow is 10/cm at low side and 14cm on raised side. Raised side is curved to match the curve of your neck. These come in different sizes - I would guess this is a small or medium

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Neck support pillow memory foam (Elvington CT15)