The Castelli Sorpasso Bibknicker fits like a second skin and is made with fabric that keeps in your warmth without overheating you when you start to push your body on the bike and raise your body temperature. The secret is in the fabric. Theremoflex fabric has a 4-way stretch so it covers your legs with no extra material snagging on the seat or creating drag. These Castelli Bib-knickers are highly aerodynamic. On the front and on the knees, where you get most wind chill, the Thermoflex Core Due fabric is added to keep you warm. The Giro++ seamless straps on the bib keep the cycling bib-knickers in place without bunching up as you are leaned forward. Even though it is mentioned last, the Progetto X2 Air seat pad is still one of the qualities that makes these bib-knickers top quality cycling apparel. The word

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