All races are not created equal. The Flemish classics like Omloop, for example, are cold, wet, and brutal. Which is why we love them. Castelli's Nano Flex Pro 2 Omloop Bib Shorts are named for that race because they're built to handle those conditions. The body fabric, Nano Flex Xtra Dry, is a classic thermal material hit with DWR, so the raindrops of spring roll off instead of soaking through. Since it's a thermal material and not a membrane, Nano Flex Xtra Dry is also extremely breathable, so your chamois stays dry from the inside and out. And frankly, a wet chamois on a cold ride is the worst part of riding in between October and April. The raw-cut leg openings sit just above the knee at the front keeping weather at bay, while tapering to a shorter length at the rear so it doesn't interfere with your pedaling. The shorts are finished with Castelli's Progetto X2 multi-density chamois, for cushioning support that keeps vibrations from causing undue fatigue letting you save every watt of energy for a race winning move.