Answer:
In buckles or lace, they help set the pace. The farther you go, the thinner they grow.
Take off my skin, I won't cry, but you will.
We are all around, yet to us you are half blind. Sunlight makes us invisible, and difficult to find
No matter how little or how much you use me, you change me every month.
What can answer in any language? What can speak without a mouth? What can sing without an ear?
People take me on walks and I run and have fun. What am I?