The hollow protuberances of the elastomeric mat produce a clearance between the depressible element and the second force translation plate when not collapsed, but collapse to allow the second force translation plate to contact and displace the depressible element when {HEAD ~ an occupant} of the specified or higher weight sits on {TAIL ~ the seating surface} 
The hollow protuberances of the elastomeric mat produce a clearance between the depressible element and the second force translation plate when not collapsed , but collapse to allow the second force translation plate to contact and displace the depressible element when { HEAD ~ an occupant } of the specified or higher weight sits on { TAIL ~ the seating surface }
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