CHECK THE SIZE CHART (in the image section above) Blue Seventy Women's Reaction Thermal Wetsuit is a variation of their Reaction wetsuit, outfitted for colder temperatures with a thermal liner called Zirconium. This unique jersey absorbs less water, offers excellent flexibility and additional protection from the elements. What makes the Reaction Thermal such a comfortable wetsuit is its combination of 2mm Neoprene and high-stretch jersey offers great mobility and reach from the shoulder. The Ribbed panels reduce bunching and improve mobility, while they have a 4-5-4 design with 4mm chest panels, 5mm neoprene around the core, hips and lower torso to lift the body and reduce drag and 4mm neoprene legs to get that downhill swim position. Features: VO2 Chest Panels - Chest panels split by flexible neoprene for more stretch and easier breathing Quick Exit Legs - 2mm Flexible legs allow quicker transitions, they can be cut up to 6" shorter for a custom fit. Thermal Liner - Upgraded zirconium jersey liner has a "wool-like" feel and dries fast, providing better protection from cold water. 4-5-4 Design S-Flex - thin 2mm side panels to improve fit and ease body rotation for a natural stroke Reactive Stretch Technology (RST) - 2mm Neoprene and high-stretch jersey offers great mobility and reach from the shoulder Aqua seal - 4-way Stretch silicone cuffs to prevent unwelcome water entry, and easy removal Knee Flex - 2mm Ribbed panels to reduce bunching and improve running to T1.