Winter is when you'll be outside, getting the hours done, the miles ticked off and building a solid base of fitness for spring and summer. And with the Sorpasso ROS (Rain or Shine) Bib Tights you can go out in most conditions and get your training done in comfort. Nano Flex Technology For the majority of the tight, Castelli uses their brilliant Nano Flex 3G fabric. It offers both incredible warmth and excellent water-repellency via third-generation nanotechnology fabric treatment. And it has a superb level of flexibility too, so the tights never feel restrictive. But not just that, the fabric is also highly breathable so you don't feel clammy when you're working hard. In areas most exposed to the weather and in need of extra protection, namely the upper front panels, thighs and across the back, you'll find Nano Flex Xtra Dry deployed. This adds both extra warmth and windproof protection while also boosting water-repellency. Sleek Fit. While the fabrics may take centre stage, the fit of the Sorpasso tights is also worth admiring. Anatomic patterning gives a perfect fit at the hips and knees, delivering smooth pedalling flexibility in and out of the saddle. At the upper body, the lie-flat bib straps hold tight but soon disappear from your mind. And then there's the fabulously comfortable Progetto X² Air seamless seat pad to make even the longest rides comfortable. Progetto X² Air Seat Pad The pro-level Progetto X2 Air Seatpad utilises ventilating perforations to keep you cooler and drier on endurance road rides. The design allows air and moisture to flow directly to the surface fabric for quick evaporation maintaining dryness. The seat pad is constructed in 3 layer components, each dedicated to a specific purpose to create the most comfortable seat pad available. There are no better tights to pull on in winter to keep you motivated to rack up those base-building miles. Come rain or shine you'll be ready to roll in comfort.