Fourth Element's Xerotherm range is a great baselayer for wearing with your drysuit, this set is a great combination for full body warmth including the Xerotherm long sleeve top, leggings and socks. 

Soft and comfortable material with flat stitched seams means this can be worn for extended periods without discomfort. The top has a long body, combined with high waistband on the leggings means both items can be worn overlapped without any gaps. Thumb loops and foot loops ensure ease of getting into your drysuit without displacement or riding up of the material. Socks are included in this bundle to give an extra layer of warmth to your feet. 

The Polartec® Powerstretch® material, originally developed for NASA, works by trapping a layer of air between your skin and the material, this provides excellent thermal protection. The Xerotherm range can be worn alone under your neoprene drysuit, or with another undersuit for extra warmth.

The fabric is the fast wicking, removing moisture from the skin and spreading this out on the external layer of the material, maintaining the layer of air between the material and your body. Perfect for wearing over your whole body. 

Xerotherm is popular with FBI Dive Teams, the Norwegian Navy and British Police Dive Units.