Strength in the shoe upper is created by a solid toe cap and triple stitched seams on the primary support sections.

If it's a single value (for example, an upper bound on a shoe size, or the maximum number of monkeys that can fit in a barrel), leave the constant as it is.

The slip last basically looks like the upper is wrapped all the way around the foot and there is one line of stitching down the middle of the shoe under the insole.