Answer:
In buckles or lace, they help set the pace. The farther you go, the thinner they grow.
What do people make that you can't see?
What do elves do after school?
Why was the math book sad?
What comes in many different sizes but is always only 1 foot long?
What is always coming but never arrives?
Funny
Animal
Difficult
Easy
Food
Kids
Logic
What am I?