See website below for a picture of the type of thing (scroll down to foot of page):


http://www.influenzaprotection.co.uk/acatalog/Clothing.html

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Note added at 27 mins (2006-06-26 12:30:39 GMT)
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Note that there are many other types of 'protective overshoe', but the blanket term seems to be applied to two major groups, the ones intended to protect the wearer, and those intended to protect the floor surface.

You might also need to consider 'slippers', depending on the actual form these take; I had assumed the disposable variety as show in the above ref., but of course they can take other forms too!

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Note added at 3 hrs (2006-06-26 15:32:26 GMT)
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There seem to be many terms used for this sort of thing, here's just one US supplier I found referring to the sort of thing you're talking about here:

Courtesy Service Products, LTD

Universal sized, skid resistant shoe covers used by realtors to protect floor,carpets and tile against contaminants. booties, surgical booties, shoe covers, protective shoe covers, disposable shoe covers, floor protectors, carpet protectors, carpet savers, reusable shoe covers, universal sized shoe covers
booties, surgical booties, shoe covers, protective shoe covers, disposable shoe covers, floor protectors, carpet protectors, carpet savers, floor savers, reusable shoe covers, skid resistant shoe covers, universal sized shoe covers, slippers

Category: Real Estate Marketing and Advertising

http://www.shoecovers.net