Answer:
What side of a cat has the most fur?
I must be broken before you can use me.
What is light as a feather but even the strongest man cannot hold it for more than a few minutes?
In wealth I abound; in water I stand; as a fencer I'm valued all over the land; at Venice I'm famous; by farmers I'm prized; respected by law yet huntsmen despised; consternation and ruin ensue when I break; And the beasts of the forest advantage won't take.
Lighter than feather and softer than silk, yet the strongest man in the world cannot hold me for more than a few minutes. What am I?
No matter how little or how much you use me, you change me every month.