bob skate

bob skate

n.
An ice skate with two parallel bearing edges.

[Possibly bob(sled) + skate.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

bob skate

n
chiefly US and Canadian an ice skate with two parallel blades
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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I didn't know people could ride those ramps like that until I saw Bob skate it.
Two-bladed bob skates are available for tots and presumably anyone else who can fit into a child's size 7 shoe.
For the very young there are usually upright aids called bob skates so they gain more confidence.
"You just hold onto it whilst on the ice and it aids with balance," he said, and helpful 'bob skates' are available for children aged two to three years.
From playing hockey in bob skates, using a willow stick and frozen horse manure for a puck, Fred Sasakamoose went on to become the first Aboriginal player in the National Hockey League.
Skating boots start at size 8 but for smaller feet the centre has Bob Skates which are double-bladed for extra stability and fit over a child's shoes.
Skate boots are available from children's size eight and go up to an adult size 15 and bob skates are available for tiny feet which fit neatly onto shoes.