rubber ice

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rub′ber ice′

Canadian. thin ice that shifts, cracks, or groans when crossed on foot.
References in periodicals archive ?
One of Joanne's best experiences was glacier-hiking, for which Joanne had to wear 'yaks feet', a type of rubber ice crampon.
But writing on a website set up by sponsors Northgate Plc, Conrad said on Friday: "I have now walked on rubber ice for the first time.
The winding Icelandic River which meandered below our home became our playground when we were growing up; playing rubber ice during the spring melting season; swimming during the summer months; skating and sledding over the winter months.