What Our Gearhead® Experts Are Saying: "I wear the Base Liner Shorts under all my baggies—they're breathable, the waistband doesn’t dig, and the chamois is just the right thickness for long days on trail without feeling bulky." The Giro Base Liner Shorts are our secret weapon for adding all-day comfort to our favorite trail kit. Designed to disappear under baggy riding shorts, these liners feature lightweight Renew Series™ recycled fabrics that breathe and move with us while wicking away moisture when the pace heats up. The wide comfort waistband stays flat and comfortable, and silicone leg grippers keep everything in place from first climb to final descent. The women’s-specific Base Chamois strikes a perfect balance of density and thickness—supportive where it counts without adding unnecessary bulk. Whether we’re logging singletrack miles or linking forest road loops, these formfitting liners keep us cool, dry, and feeling great under any outer layer.