A glass sits in an insulating plastic holder. The holder has a large handle and supportive edging that allows a two-handed grip. The large base prevents the mug from tipping.
E.g. www.etacbutiken.se (senast kontrollerad May 2017)
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For persons having difficulties keeping a cup steady while drinking, there is an alternative, a cup with a rotatable handel, se www.handsteady.com (last checked May 2017).
This tip is from 2005