Waders in general have no responsibility to keep you warm, only to seperate you from the water you are wading in. Warmth and personal comfort come from layering under your wader with a wicking antimicrobal under garment such as simms waderwick tops and bottoms. Perspiration must be moved away from your skin in order for you to be warm, and if the breathable wader can expell this moisture to the outside , all the better for your comfort. Simply add more layers as the temperature lowers and remove layers as the temperature rises.