Polypropylene dominates the fiber blend in the Comp Racer, and that's a deliberate choice. Giro builds these socks with 60% polypropylene because the material moves moisture away from skin faster than polyester alternatives. Where polyester absorbs sweat and holds it against your foot, polypropylene pushes liquid to the outer surface where it can evaporate. The Comp Racer pairs this hydrophobic base with Meryl Skinlife fibers, which manage bacteria at the fiber level rather than relying on topical treatments that wash out over time.

The 3" cuff hits a practical sweet spot for road and gravel use. It's tall enough to protect your ankle from sun exposure and debris without the visual bulk of a 6" crew sock. The blend includes 10% Lycra and 10% elastic, concentrated around the arch to keep the sock from migrating during long efforts. The top of the foot uses lighter-weight knit zones that allow heat to escape rather than trapping it against skin, which matters when temperatures climb and your feet are locked inside cycling shoes with limited ventilation.

Synthetic construction throughout means faster drying times than cotton or wool options. If you're commuting and need socks that recover quickly between rides, or racing in conditions where foot sweat becomes an issue, the moisture transport keeps things manageable. The nylon content adds durability to high-wear areas without adding bulk, helping the sock hold up through regular use. The Comp Racer works across road, gravel, and mountain disciplines without specialized features that would limit its versatility.