Triathlon gear tends to be hyper technical, full of things like carbon fiber weaves, anti magnetic properties, and static defeating fabrics. Really The Castelli Core Men's Tri Top is a little more sensible, and a lot more affordable, with a focus on fit and function rather than electrophysics. The Core Tri's base is Castelli's Tempo 3 fabric, which is aerodynamic, lightweight, stretchy, and highly breathable. It wicks moisture away from your skin to enhance cooling, and dries incredibly quickly so you're comfortable and ready to run before you even leave the first transition zone. Castelli integrated its unique Speed Hooks, too, which create a sleek connection between top and shorts to ensure full coverage and increase aerodynamic efficiency. It also gave the Core Tri dual side entry back pockets, called Free Pockets, which reduce material with their unique design while still carrying just as much as a classic three pocket design.