Even those of us who are staunchly in favor of wearing shorts and warmers for cool weather can appreciate that, with water repellant kit like Castelli's Nanoflex 2 Bib Tights, the uninterrupted fit of full length tights has the benefit of eliminating any possible gaps where rain can get in. The Nanoflex 2 Bib Tights may lack the all weather versatility of pairing shorts with warmers, but when it comes to complete protection against the elements, the coverage of tights is tough to argue against. The secret to the Nanoflex Bib Tights' success is hidden subtly in their name. They're made from Castelli's Nanoflex fabric, which is a water resistant version of the insulating Thermoflex fabric. Nanoflex is coated with millions of nanofilaments to create a water repellant surface, compelling rain and road spray to bead up and roll off the surface. Of course, the introduction of those nanofilaments doesn't interfere with Nanoflex's thermal properties, and the brushed interior not only keeps warmth in, but it also wicks moisture away from your skin. The Nanoflex Bib Tights keep you dry from inside and out, because nothing puts the stop to a cool, damp base mile session faster than the accumulation of clammy moisture on your skin. The bibs are made from breathable mesh that won't interfere with your upper body layering with patches of extra insulation, and gripping bands and zippers at the ankles maintain water repelling coverage. The inclusion of Castelli's Kiss Air insert ensures a comfortable cyclist to saddle interface with a varying topography of breathable padding and a soft, bacteriostatic cover.