Despite all their benefits, some wetsuits can cause notable shoulder fatigue for some athletes -- not to mention, sometimes water temperatures aren't conducive to full-sleeve coverage. For this reason, Xterra makes a sleeveless version of its top-spec suit, in the form of the Xterra Vendetta Sleeveless Women's wetsuit. While the standard Vendetta utilizes two types neoprene from neck to ankle to balance weight, buoyancy, and range of moment, the sleeveless version employs the company's most buoyant and hydrodynamic neoprene across almost the entire piece. A 5mm-thick version called X-AIR, which employs a dimpled surface that promotes hydrodynamic efficiency, not unlike the surface of a golf ball, comprises all panels of the suit, with the exception of a slightly thinner 3mm version used on the upper back. The dimple effect also serves to "capture" tiny pockets of air as bubbles move over the body to increase buoyancy. The entire suit is then coated in Nano-Super Composite Skin, reducing drag to an industry-low 0. 02 coefficient, while X-MAX triple seam-sealing and double-stitch bonding promises a lifetime of waterproofing and durability. The cut and paneling of all that material is equally as important, and Xterra pays particular attention to those details, as is demonstrated perfectly by the Vendetta. The low-profile collar stays out of the way -- something veterans of old-school wetsuit designs will surely appreciate, as they will the 30-inch lanyard for the rear zipper with a hook-and-loop patch for fastening. Finally, the X-FLEX liner that's applied to the entire interior of the suit further facilitates natural movement and allows the suit to return to its original, supportive form even during rigorous activity. The Xterra Vendetta Sleeveless Women's Wetsuit comes in nine sizes, from X-Small to XX-Large, and in the color Black.