She accordioned the papers so that they would be sturdier for the craft project.
Sturdier fabrics often have a slight corduroy look and feel to them.
If you actually want to stroll with your stroller, then a sturdier stroller with double wheels and a durable frame is a good choice.
It is usually mixed with other metal alloys in order to make it sturdier.
Pants meant for activities and for casual wear are usually made form heavier and sturdier materials like cottons, canvas and other cotton based blends.