You can use layers from different manufacturers with each other.

Using layers from different manufacturers is considered true because layering is a principle applied in dry suit diving that focuses on insulating and protecting the diver from water and cold temperatures, irrespective of the brand. The effectiveness of thermal layers largely depends on how well they fit under the dry suit and their ability to trap air, not strictly on the manufacturer's compatibility. Divers often combine different layers to achieve the best thermal protection and comfort based on their personal preferences, local conditions, and dive profiles.

It's important for divers to ensure that the layers fit appropriately under their dry suits to maintain effectiveness and comfort. While different materials and designs may vary in performance, there’s no inherent restriction that prevents divers from mixing brands as long as the layers are functional together in providing insulation and moisture management.