As one of the most popular items in the entire castelli line the castelli velocissimo 3 bib tight has a lot to live up to its thermoflex fabric provides all the warmth and comfort you need for long harsh days on the bike especially when the temperature starts to drop this fabric enhances comfort through a number of different ways compression for greater muscle support breathability so youre at the optimum temperature and moisture management to ensure your sweat is lifted away from the s