HUUB's Alta Buoyancy Shorts feature HUUB's exclusive X-0 SkeletonTM for superior body alignment and stroke efficiency. Made from high quality neoprene, these shorts have been designed and developed with SwimSmooth to provide an optimal training tool for stroke technique and body alignment. X-O SkeletonResearched with Huub Toussaint and Swim Smooth, the X-O Skeleton is the spine and support structure of the suit, holding the core of the swimmer straight and aligned in the water. Many swimmers increase their drag and lose efficiency by fish-tailing their hips side to side. The X-O Skeleton supports the swimmer and allows them to cut through the water arrow-straight and encourages a more efficient swim stroke.