Spaghnum moss and coco husk are pretty soft so they won't rip the skin as your snake moves around, but they are hard to keep super clean so your snake's skin doesn't pick up an infection. The moss can be disinfected before use by boiling it (according to web sites where it's used for gardening) so maybe just have a large humid hide with only moss. I would be worried about bits of coco getting under the snake's skin.