With 2 different weights of fabric, both textured, to pull perspiration away from the skin you can stay comfortable when working hard in cooler conditions. Lighter weight panels under the armpits improve evacuation of moisture.
We have found a fabric that is soft and comfortable next to skin, but works hard for you. In design we ensured no stitched seam under the armpit to avoid uncomfortable chafe, the low collar protects from possible pack rub on the neck and the zip helps ventilate or close in warmth as required.
For many years Adventure racers wore cycle jerseys. We just continue that theme of 3 rear pockets into products specifically designed for running, ensuring pockets can still be reached while wearing a race vest/ running pack. Our zip sliders are sprung loaded so they don't rattle annoyingly under you chin. Details are details for a reason.