Running shoe sizing, brand by brand.
Which brands run small, which are narrow, and which come in wide fits.
adidas
True to size · Narrow
Sizing guideAltra
True to size · Roomy toe box · Wide fits
Sizing guideASICS
True to size · Standard width · Wide fits
Sizing guideBrooks
True to size · Standard width · Wide fits
Sizing guideHOKA
True to size · Standard width · Wide fits
Sizing guideKarhu
True to size · Standard width
Sizing guideNew Balance
True to size · Standard width · Wide fits
Sizing guideNike
True to size · Narrow · Wide fits
Sizing guideOn
True to size · Standard width · Wide fits
Sizing guidePUMA
True to size · Narrow
Sizing guideSalomon
True to size · Narrow
Sizing guideSaucony
True to size · Standard width · Wide fits
Sizing guideTopo Athletic
True to size · Roomy toe box
Sizing guide
Still gathering fit reports for Inov-8, Kiprun, Mizuno, Mount to Coast, Norda, R.A.D, VJ. Until then, their own size charts are the best guide.