Engineered to provide cross functionality for each leg of your race, the Castelli Body Paint Tri Sleeveless Jersey is fast drying, highly elastic, and soft against the skin. This is due primarily to its microfiber, Body Paint tri fabric, but its one piece design contributes significantly as well. The one piece construction eliminates seams for less chafing in areas prone to rash. Additionally, Castelli incorporated a seamless design decreases both the jersey's aerodynamic and hydrodynamic profiles. Meanwhile, especially important for coming out of T1, Body Paint's microfiber content makes this jersey extremely fast drying. But, before you even get out of the water, you'll find that the jersey's 3mm layer of soft foam provides positive flotation for swimming. And once you head into the run, Body Paint's infused titanium dioxide fibers the active element in sunscreen reflects the sun's rays while maintaining a consistently lower temperature at the jersey's surface. For nutrition storage, Castelli has included two pockets. However, with drag reduction at the forefront of the design, Castelli placed flaps over the openings. Essentially, this prevents the pockets from filling with water and air counter to your direction of movement, effectively minimizing your drag profile. The Castelli Body Paint Tri Sleeveless Jersey is available in the color Black and in seven sizes from Small to XXX Large.