Profile Design's Women's Bionik 2 is perfect for all your training and racing. Made with Yamamoto #39 neoprene on the body and #40 on the shoulders and neck for flexibility, this sweet suit is as comfortable as it is durable. It seals out water, is super smooth to slip on and off quickly, and speeds through the water thanks to its SCS (Super Composite Skin); a super-slick outer surface. For an awesome fit and feel, this sweet suit has ultra-flexible, multi-directional stretch textile in the shoulders and armpits plus 7mm neoprene inside and outside the collar to eliminate chafing. You also get grooved arm panels, which provide additional resistance during the pull phase of your stroke and 3mm neoprene behind the knees for increased flexibility in and out of the water (transitions). And, even the reverse zipper works in your favor. It conforms to your back as you swim for little drag, is designed to prevent accidental opening in the water and also to open as quickly as possible. For faster removal, there are shorter-cut arms and legs, too.