This is Aero Tech Designs’ Men’s Support Liner Short, a padded cycling undergarment in breathable black polyester stretch mesh with a support chamois shaped into a cup-style front. The perforated pad runs thick enough for three-to-six-hour saddle stretches.
It turns hiking shorts and casual pants into riding gear while adding front support that standard flat liners skip — the six-panel anatomical cut, flatlocked seams, and light elastic leg hems sit smooth against skin under whatever goes over it.
Aero Tech Designs has designed and sewn cycling apparel at its factory in Coraopolis, Pennsylvania, outside Pittsburgh, since the 1980s, with one of the widest size ranges in cycling.
