Mares Mens Thermo Guard 0.5mm Long Sleeve Body Core Protection for All Water Sports Offering more body core protection than a standard rash guard, the Thermo Guard is perfect underneath your suit for better heat retention during diving. Thanks to its thermal & UV protection, it's also ideal for snorkeling, surfing, kayaking & for any other water-sports use. 0.5mm super elastic neoprene with Metalite coating on the inside conducts heat, is easy to put on, & provides UV protection Flat stitch for comfortable contact on your skin Sizing Chest (inch) Waist (inch) Height (inch) Chest (cm) Waist (cm) Height (cm) Size 2 / Small 35-36 31-32 5'5" 89-92 79-81 165 Size 3 / Medium 37-39 33-34 5'7" 94-99 84-86 170 Size 4 / Medium Large 40-41 35-37 5'11" 92-104 89-94 180 Size 5 / Large 42-43 38-39 6'1" 107-109 97-99 185 Size 6 / Extra Large 44-45 40-42 6'3" 112-114 102-107 190 Size 7 / Extra Extra Large 46-48 43-44 6'5" 117-122 109-112 195 * Please note not all sizes are available in all models