Slipper

Two Shapes, One Purpose

Slippers divide by how the foot enters. The shoe-shaped slipper encloses the heel and takes the foot through the top, staying on through stairs and quick trips to the door; the backless slipper, a mule shape, lets the foot slip in from behind with no bending down, trading security for speed, and it is the shape meant by the verb the footwear is named for. Materials follow the room. Felt is the classic, warm, quiet on hard floors and cheap to replace; soft leather, sometimes lined with felt or sheepskin, is the durable and warmer option, and sheepskin slippers are a retail category of their own for women and men alike. What no house slipper offers is structure: no ankle support, minimal sole, no weatherproofing, because the indoor floor asks for none of it, and the softness is the entire point of changing out of street shoes at the door.

The Slipper Beyond the House

The word slipper does more work than the object does. Hotels and airlines issue disposable slippers as a signal that the guest may treat the room as home; hospitals and spas use washable versions for hygiene; and the wet-area slipper in plastic or rubber belongs to pools, bathrooms and changing rooms, where its job is grip and a barrier against wet floors rather than warmth. Language stretches the term further still: in Hawaii the flip-flop is called a slipper, and in Commonwealth schools a slippering was a punishment administered with a gym shoe, so the same word can name a backless beach sandal, a felt house shoe and a plimsoll depending on where it is spoken. Travellers learn to translate by context. In the definitions of the footwear trade, though, the slipper keeps its strict sense: the soft indoor counterpart of the shoe, the first footwear put on in the morning and the last taken off at night.