Xcel long sleeve rash vest * Engineered fit system * Waffle thermo insulation * Flat seam construction * Thumb loop * Xcel branding * Colour: Black The new Insulate-X Thermal Longsleeve Rashvest features a waffle thermo insulation technology that will dramatically increase the warmth of any wetsuit. This vest is a great way of increasing warmth in cold snaps or deep winter without having to buy a thicker, more expensive wetsuits.