The First Wave provides ultimate comfort and eliminates restrictions often found in one-piece wetsuits. This is why the T1 First Wave is a triathlete's First Choice! The two-piece design of the T1 Wetsuits offers more comfort and less restriction. The top and bottom are not attached. This means you have much more freedom of movement and there is no “torso-rubber stretch” or shoulder fatigue that occurs with one-piece wetsuits. All T1 models are sold as separates for a customized and personal fit. With up to seven sizes of tops and bottoms, you have 49 possible size combinations from which to choose. Other features we innovated many years ago include lower necklines and thicker rubber in the legs and hips to help float the largest bones and muscles in the body. More floatation here means more speed. T1 Wetsuits are not filled with gimmicks, just physics. New Features: Zipper is lighter weight and corrosion resistant Less-toxic bonding agent for people with skin sensitivities Favorite Features Remain: Flexible 2mm body and arms with a lower neckline for comfort BIO-STROKE design puts your arms into a forward rotated shoulder position for a more efficient swim stroke YKK® custom zipper is small, lightweight, and makes removal easier than ever. GreenGoma™ #9 Rubber with Super Composite Skin makes the First Wave the warmest, fastest, most durable, flexible, buoyant, and the most comfortable wetsuit in the world today. Lined with 4-Way stretch Nylon Lycra® for comfort and to minimize chafing Seams are glued and blind-stitched, making them more durable than the rubber itself Sleek graphics, no gimmicks Sold as separates for a true customized fit Chlorine resistant treatment, but not recommend for repeated use in chlorinated water. Proper swim stroke includes swimming with your head slightly tilted up. Imagine how your head would be if you were reaching for something in an upper shelf of a cabinet. That said, the snug part may require a certain "getting use to.” The other part to know is that it will also relax a little bit over time by wearing it. It is important that the neck be snug so that water does not freely flow in while swimming. Whether you like to swim for exercise or are on the swim course of a Triathlon, T1 Wetsuits offer you speed, comfort and buoyancy that will make swimming pure pleasure!