We have tested them with muck boots wellingtons and gardening shoes as well as our regular shoes and walking boots.
The fit depends on style and width but here is what we have found for sizing:
good for shoes UK4, UK5, UK6 (for wide / chunky UK6 consider medium instead)
good for hiking & wellington boots UK4 & 4 1/2 (for chunky UK5 hiking boots & wellies consider medium Yaktrax)
good for shoes UK7, UK8, UK9.
good for hiking boots & wellington boots UK5, UK6, UK7, UK8, UK9
(my current UK9 wellies are quite chunky and whilst mediums are okay, large Yaktrax are an easier fit.)
good for shoes UK10, UK11, UK12
good for wellingtons UK10, UK11, UK12
Please email us if you would like advice on the correct size for your boots or shoes.
See our Yaktrax Pro demo movie