PLEASE NOTE: WE ORDER THESE ITEMS AS WE GO ALONG, SO WE NEED TO CHECK FIRST TO MAKE SURE THERE IS AVAILABILITY. PLEASE EMAIL US BEFORE YOU PLACE YOUR ORDER  MANY THANKS IN ADVANCE.WATERWORLD SPORTS "The ultimate baselayer for use under a drysuit. Made using Polartec® Powerstretch® originally developed for NASA, the Xerotherm traps a layer of air - a much better insulator than water next to the skin, keeping the wearer drier and more comfortable. The range is designed to be worn under another undersuit or on its own under a neoprene drysuit. The knit of the Xerotherm fabric produces the fastest wicking effect of any of the products in the fourth element product range. Moisture is drawn out through the fabric along fine fibres and then spreads out over the outer surface. This maintains a thin layer of air next to the skin. This is so effective in the Xerotherm that some wearers report experiencing minor suit leaks during the dive without even noticing until after the dive. The Xerotherm is specified by the FBI Dive Teams, Norwegian Navy and British Police Diving Units. Domestic machine washable. We recommend using Sub30 Technical Garment Wash, fourth element’s environmentally friendly washing solution for technical fabrics" Outstanding thermal performance Lightweight Extremely fast-wicking Machine washable Performs when wet