We've built the Sway Longsleeve Neoprene Vest with our most premium rubber, Yamamoto 39 Purposefully crafted to keep your core warm, this 2mm Neoprene jacket for women features smooth skin on the chest and back, with flatlock stitching to create strong yet flexible seams. The Sway vest can be worn with a swimsuit or bikini top underneath, and matched with the bottoms of your choice, making it a versatile choice for your next session in warmer waters.