Answer:
Gets rid of bad ones, short and tall. Tightens when used, one size fits all.
When the day after tomorrow is yesterday, today will be as far from Wednesday as today was from Wednesday when the day before yesterday was tomorrow. What is the day after this day?
What loses its head in the morning and gets it back at night?
This is in a realm of true and in a realm false, but you experience me as you turn and toss.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.
What never gets any wetter no matter how hard it rains?