is top-grain leather that has been sanded or buffed on the grain side, produce a velvet-like surface. You can see Nubuck on the blue bits of the nearest boat shoe. It’s not as hairy as suede and is not polished – rather it is kept looking nice by brushing with a wiry brush to keep the short pile created by the buffing from going shiny and matted.
…looks like hairy Nubuck – but it is actually made from the underside of the skin (i.e. the bit that originally pointed towards the animal’s insides!) – not the outer layer. It is also maintained by brushing, not polishing – and is seen on the Loake Haydock chukka desert boot here.