CHECK THE SIZE CHART (in the image section above) Blue Seventy's Women's Reaction Sleeveless Wetsuit has been improved with a more flexible upper body and new lower leg panels for quicker transitions. Their main sleeveless suit, it has unmatched arm freedom and T1 speed. What makes the Reaction 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. 4-5-4 Design Flexibility - Upgraded jersey liner makes this as flexible as our Helix, and 1.5mm thin arms provide more flexibility, comfort and speed. 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 Sleeveless - Allowing the most natural stroke and quick T1 Knee Flex - 2mm Ribbed panels to reduce bunching and improve running to T1.