If Castelli is going to call its Women's Sorpasso Bib Tights the best bib tights it's ever made, who are we to argue When you look at them on paper, it makes sense, although when you take them out for a spin that's where they win you over. The Sorpasso Bib Tights start with Castelli's remarkable Thermoflex Core Due material. This hollow core polyester fiber material plays the seemingly contradictory role of insulating your body, protecting from the wind, and retaining warmth in the lowest temperatures, yet still allowing incredible breathability and stretch, and serving to help evaporate moisture that accumulates within, so you always stay comfortable. Castelli's own team of testers couldn't believe the temperature range that the Sorpasso's could comfortably accommodate. Castelli's standard Thermoflex material is used along the tights' rear panels, where wind protection isn't as necessary as providing a comfortable and supportive fit, while also saving a bit of weight and further promoting breathability. If the superiority of the Sorpasso's materials isn't enough, then certainly the comfortable, seamless Giro bib straps and the Progetto X2 Air chamois will seal the deal. Those straps mean zero chafing, and their wideness distributes their pressure over a wide area so you barely feel they're even there. That Progetto chamois is designed for maximum support of the sit bones or ischial tuberosity, relieving sensitive soft tissue of pressure, while also serving to evacuate accumulated moisture from down below to preserve comfort and prevent soreness. The Castelli Women's Sorpasso Bib Tights come in five sizes, from X Small to X Large, and in the color Blackwhite.