Slippers Are Thrown Away Because They Cannot Be Cleaned

Slippers are worn on bare feet for hours a day and never cleaned. That is the actual lifecycle: six months of daily wear, a gradual decline nobody wants to discuss, and a bin. A pair that survives a cold machine wash resets that clock repeatedly, which is worth more than any amount of plush.

A knitted chenille upper handles washing in a way a faux-fur lining does not. Long-pile linings mat and clump once wet and never recover their loft; a knit comes out of the machine looking much as it went in. If a pair is going to be washed, this is the construction that survives it.

The memory foam is doing the comfort work regardless. The upper decides how they look and how they clean; the footbed decides how they feel, and a moulded foam layer is what makes an hour standing in a kitchen bearable on a hard floor.

• A sister who wears slippers constantly and replaces them constantly
• Anyone who would actually wash them if they could
• A household with hard floors, where slippers pick up everything
• Christmas, where a warm inexpensive gift suits the occasion

• Can be washed, so they last considerably longer
• Memory foam footbed for hard floors
• Cheap enough to give alongside something larger

The things worth checking before you order — this is where gifts like this most often go wrong.

• Wash cold and air dry flat. A hot wash or a tumble dryer will shrink the knit and permanently compress the foam, which undoes the one advantage you bought them for.
• Check the sole before assuming they can go outside. Many knit slippers have a thin indoor sole that wears through quickly on concrete and is slippery on wet ground.
• Slipper sizing runs inconsistently and these are often sold in size pairs rather than single sizes. Read the seller's chart, and size up rather than down if she wears socks with them.
• Memory foam flattens with time regardless of washing. Expect a year or so of real cushioning — these are a consumable, which the low price reflects.