The Mares Thermo Guard is very easy to put on and as a standalone provides great 50+ UV Protection from the Sun"s Harmful Rays. The Thermo Guards have a Metalite Coating that helps Retain Heat for Superior Warmth. All Seams are Flat-Lock Stitch for Comfortable Contact on your Skin. Thermo Guard offers more Body Core Protection than a standard Rash Guard. The Thermo Guard is made from Skin-In 0.5 mm Neoprene Rubber which creates a Seal with your Body to Reduce Water Seepage keeping you Warmer Longer. The secrete to keeping warm in an Exposure Suit is Layering. The Thermo Guard is perfect underneath your wet suit for better Heat Retention during diving. Thanks to its Thermal and UV Protection Qualities, the Thermo Guard is also ideal for any other Water Sport use. The Thermo Guards are available in 6 sizes from Small to 3X-Large and are covered by a 24 month limited warranty.