Endurance 4 Bib Short - Men's

What Our Gearhead® Experts Are Saying:

"I’ve ridden just about every chamois out there, and the Progetto X2 still stands out—it feels dialed from mile one to mile one hundred. The fit is snug and supportive, and the materials breathe really well, even on hot, exposed climbs. These are my go-to for big days."

The Endurance 4 Bib Short is built for cyclists who demand lasting support, refined fit, and high-end comfort during their longest days in the saddle. Castelli’s Progetto X2 Air Seamless chamois sets the standard for plush, friction-free support across long distances, with a dual-density design that adapts to changing ride conditions and rider movement. Whether you're tackling alpine centuries or stacking base miles, the chamois stays smooth and supportive.

Endurance Evolution fabric wraps the lower body with light compression to support muscle efficiency while wicking moisture away to keep your skin dry and cool. Mesh bib straps and a ventilated back panel provide additional breathability and stretch, keeping everything in place without excess bulk. GIRO3 leg grippers hold the shorts in place securely with a smooth, unrestrictive feel.

From high-mileage training blocks to epic one-day events, the Endurance 4 Bibshort is engineered for road cyclists who demand pro-level performance with real-world comfort over long distances.