Espadrilles - these are also called beach shoes and have plaited fibre soles that are no thicker than 2.5 centimetres. They don't have heels.
Flip-flops - these are also referred to as thongs. The thongs - or straps - are fixed by plugs that lock into holes in the sole.

Hiking or walking boots - note that these aren't classified as sports footwear.
Sandals - these have leather outer soles and leather uppers. The upper consists of straps that cross the instep and go around the big toe.
Moccasins - these use a single piece of material - traditionally soft leather - to form both the sole and the upper (or part of the upper). This makes it difficult to identify where the outer sole finishes and the upper begins.
Neoprene footwear - this is typically used in diving and water sports. If the neoprene upper is covered or laminated with textile on both sides, then it's classified as being made of textile. If the upper has no textile covering, or it's covered only on one side, then it's classified as being made of rubber.
Safety footwear - footwear in which the toe caps are made of metal.
Sandals - the front part of the upper (the vamp) consists either of straps or of material with one or more pieces cut out of it.
Shoes - this term covers footwear, including trainers, that aren't described elsewhere in this guide.
Slippers - these include mules as well as other indoor footwear such as ballet slippers and ballroom dancing shoes. If the outer sole is made of plastic or rubber (approximately 1 centimetre thick) and then covered by a very thin, insubstantial layer of textile material, the slippers are classified as having 'plastic/rubber' outer soles.