The harness is designed to easily secure a child in a highchair. The user uses it when the child is sitting on his lap.
Model: Wriggle Wrapper from Phil&Teds
The same harness is used when the child sits in the highchair, see related tip.
Phil & Teds
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Phil&Teds does not sell the Wriggle Wrapper anymore. It might be available on ebay, www.ebay.com (last checked July 2017).
This tip is from 2013