Free Shipping on Orders Over $99

Free Shipping Policy

Free Shipping applies to all orders placed for $99 and above
(pre-tax value). Some restrictions apply:

  • Offer valid in the Lower 48 States only
  • Excludes Travel Cases and some other oversize items (prices can be calculated in the cart before checkout)
Take 15% off first full priced item with: SAVE15


Offer valid for 15% off qualifying items.

Some exclusions apply.

For questions, contact us by calling 1.800.627.6664 or Chat Now

Castelli Endurance X2 Bib Shorts

If you look for certain descriptive buzz words in cycling apparel products, it helps you better understand the design and purpose of the particular garment. In this case, when words like endurance or long distance are used in a bib short, it generally means the bibs are going to be built with less compression for a less restrictive feel. In some cases, it will also mean the bib cut will be slightly larger to accommodate a bigger body type. All of the latter is true with the Endurance X2 Bib Short. Castelli was wise enough to add enough elasticity so they fit just about everyone, not just larger riders. Add the best seat pad that Castelli produces and bring the price in at under $150 and you can see why it is one our best-selling bibs.

The Endurance X2 is constructed from 8 panels, each of which are anatomically cut and made from Endurance Evolution fabric. This compressive, but less restrictive fabric offers a good blend of muscle compression and comfort. It also provides excellent moisture control through push-pull perspiration wicking. The leg grippers are Castelli's proven Giro++ design and give a natural feeling extension and termination of the garment on your thighs. The Giro++ gripper manages to stay attached to your thigh without binding or applying too much pressure. The uppers feature wide suspender bands that do a nice job at spreading out the load and stress. Full back panel keeps everything in place.

These bibs are finished off with the amazing Progetto X2 insert. This elastic insert features a two piece construction. The first piece is the base. This is the working part of the chamois which has three gel areas that are located at your sit bones and soft tissue areas and is sculpted for an anatomic fit. The second is a skin care layer that is bacteriostatic, soft and seamless to prevent chafing. When you combine these two parts into one unified chamois, you get one of the best cycling inserts ever produced. Due to the construction of the insert, you can pin the chamois into the bibs prior to stitching for a perfect, non-wrinkled fit.


  • Endurance Evolution fabric
  • Progetto X2 Air seat pad
  • Giro3 leg grippers
  • Rear reflective tabs
  • Less restrictive feel
  • One of our best-selling bibs
Reg Price $149.99
Close Window

Castelli Sizing Chart

Mens Shorts, Bibs, Knickers & Tights
Mens Jerseys, Jackets & Vests
Womens Shorts, Bibs, Knickers & Tights
Womens Jerseys, Jackets & Vests
Palm Circumference6-7"7-8"8-9"9-10"
Mens Socks
Womens Socks


Write Review

Average Rating:


Posted on 6/21/2016

An outstanding bib short! Order 1 size up, and the fit should be right. Everything about this short is "right"----right price, right fit ,right chamois. The other word that comes to mind is comfort. The "Endurance" is one of the most comfortable bibs that I have used.

Pros comfort/price

Cons none


Posted on 8/20/2015

Based on the description I ordered a size Large in these bib shorts, which is the size that I wear in Pearl Izumi. Way too small, and definitely not cut bigger as the description states. Order a size larger unless you are a beanpole.

Cons Fit is a size small