Complete your dry suit with the proper thermal protection including a warm undergarment for your core and extremeties, as well as socks and gloves to keep the hands and feet comfortable in even the coldest of waters.
Materials: Fleece, wool and synthetics are all ideal for use under your dry suit and will retain warmth even if wet. Cotton is not recommend as it will not remain warm when wet and will not dry quickly.
Tempurature Recommendations: Some dry suit under garments have recommended temperature ranges. These are a guideline only. Be aware of your personal needs and have multiple layers to add or remove as necessary.