I'm a shape shifter varied in colour and size; But when you see me I'm easy to .................... yield . What am I?

Question

I'm a shape shifter varied in colour and size
But when you see me I'm easy to recognize

At times a shady character, other times not
I might be able to help you in a hot spot

Usually unemployed in the season of cold
But working year-round if you are willing to hold

With your assistance I act as a lightweight shield
So as to counteract what the heavens may yield

What am I?

Answer 1

An umbrella it changes shape (from open to close)
It varies in size and color
Used to create shade
Not usually used in the winter
The key is that you hold it. And it's a lightweight shield (neither of which apply to a tree).

Answer 2

A tree
It's easy to recognize
Provides shade
It can be made into many things to protect you

Answer 3

Of course UMBRELLA

Answer 4

an umbrella maybe?

Answer 5

ANSWER: UMBRELLA