2D Collider Transform for Sliding

Hi guys, I'm working on a 2D game ... what I'm trying to achieve is when the character have in front an object (platform in my case) to be able to sliding underneath not to collide with it, like in my graphic here:

How can I Transform the collider position when the character is sliding ? Any ideas ?

 

Why not simply switch to a different collider?

 

Hi SpacemanBoots, how exactly to do that...can you be more explicite ?

 

Put 2 colliders on an object. One that's shaped to your character standing straight. And the other shaped to your character sliding.

So when your character is in his "Standing" state, you disable the sliding collider and enable the standing straight collider.
And when you character is in his "Sliding" state, you do the opposite.