Nourishing shampoo & conditioner for easily matted hair?

I’ve been struggling with the back of my hair getting matted lately and not very many products have been seeming to help. Most products either weigh my hair down, or it dries it out. Can anyone recommend a good shampoo and conditioner that helps with this?? I was using Kevin Murphy which made my hair feel really nice but I would prefer to find something more reasonably priced if possible!