• Castelli's best-fitting tight, for a wide range of cool to cold conditions
• Thermoflex Core2 front and knees for extra warmth
• Thermoflex over thighs and back of legs for extra stretch
• 3D support band at lower back and flat bib straps for extra comfort
• Progetto X2 Air seat pad for long-distance rides
• YKK® Camlock® zippered ankle openings with Giro3 elastic and reflective zip cover
• Temperature Range: 5°-12°C / 41°-54°F

Castelli say:

The Sorpasso Bibtight is our best winter tight because of its exceptionally wide comfort range and the amazing fit. And both of these features come from the combination of our Thermoflex Core2 fabric and our standard fleecy Themoflex.

The Core2 fabric is made with a hollow-core polyester yarn on the inside and a nylon outer face, which together provide excellent insulation for cold temperatures along with better wicking to keep you comfortable when it's not so cold. This fabric offers some wind protection but is somewhat limited in stretch, and that's where the extremely stretchy Thermoflex fabric comes in.

The overall effect is a tight that offers optimal compression and seems to just move with you.