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Memory foam is polyurethane with additional chemicals increasing its viscosity and density.

It is often referred to as "viscoelastic" polyurethane foam, or low-resilience polyurethane foam (LRPu).

Higher-density memory foam softens in reaction to body heat, allowing it to mold to a warm body in a few minutes.

Newer foams may recover more quickly to their original shape.

A bed sheet is a rectangular piece of cloth used as bedding, being placed immediately below or above bed occupants.

Bed sheets can generally be divided into two categories: "top" and "bottom" sheets.

A pillow is used to sleep on and support the head/neck or other parts of the body while sleeping, lying down or sitting.

In addition, pillows have decorative uses and are used on beds, couches or chairs; these are also referred to as cushions.

A duvet (or; from the French duvet "down") is a type of bedding consisting of a soft flat bag filled with down, feathers, wool, silk or a synthetic alternative, and typically protected with a removable cover, analogous to a pillow and pillow case.

Sleepers often use a duvet without a top bed sheet, as the duvet cover can readily be removed and laundered as often as the bottom sheet.

Duvets originated in rural Europe and were filled with the down feathers of ducks.

The best quality is taken from the eider duck, often while still alive, for its down is known for its effectiveness as a thermal insulator.

Silk is a natural protein fiber, some forms of which can be woven into textiles.

The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons.

The best-known silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyx mori reared in captivity (sericulture).

The shimmering appearance of silk is due to the triangular prism-like structure of the silk fibre, which allows silk cloth to refract incoming light at different angles, thus producing different colors.