They can be. However, there are very specific IRB and NRL regulations appertaining to Rugby footwear. If you look at the link here it takes you directly to the section. Note that a referee can make a player / team change their footwear if they feel that the boot/shoe does not meet the regulation. http://www.irb.com/mm/document/lawsregs/0/060924gfirbregulation12_879.pdf
The use of studs in boots appears to be the preferred method of players
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Blades are allowed so long as they are plastic, not metal, and do not exceed 21mm in length.