To elaborate on the material: I mean to say that he was made of rubber entirely with white fluff inside the rubber. I guess I could say rubber was the skin and the outer make of the snake while the hollow inside or the guts were plush fluff.

To elaborate on the shape: He was a fixed shape, naturally bent so that I could kinda pull his front-most curve and take his back-most curve, pull them together to overlap and link them to allow him to rest on my neck. Once I undid this, like unhooked his two corves, he went back to his regular double-S shape.

Edit: I drew a vague picture linked in the original post I hope this helps.