While Castelli's winter apparel uses its thermal Themoflex fabric, the Nanoflex Bib Shorts take warmth one step further with water-resistant, thermal Nanoflex fabric. This fabric is coated with nanofilaments to create a water-repellent, wind-blocking surface while retaining a soft, fleecy interior. If the weather is bitterly cold, we suggest the Castelli knee or leg warmers to cover your exposed skin. To add to their comfort, the Nanoflex bibs incorporate breathable mesh straps and the Kiss 3 chamois. This insert is designed with a seamless microfiber to minimize chafing. The Kiss 3 also has variable density foam so that your body will be comfortable no matter how long you ride.
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