Lasting Pressure
The lasting pressure is the amount of tension required to stretch the upper on the last form. To much lasting pressure can damage, rip or wrinkle the upper. Too little lasting pressure will result is a soft ill formed, baggy upper. It’s upper to the pattern master to get this right, it’s a skill as different materials will require different patterns and amounts of lasting pressure to look right.

Lasting pressure Some parts of the shoe pattern are stretched into shape by force. This force is called lasting pressure. The toe cap and vamp materials generally have the highest lasting pressure. Eyestays, collar lines, and the medial arch area require the least lasting pressure.