This tight is designed for maximum warmth, while everything else is almost simple. The front is completely windproof thanks to the AirFlex Thermo fabric, which features an elastic polyurethane membrane that keeps the wind out while remaining elastic enough to move with you. The inside of the fabric is thick and fleeced to add extra warmth. We built the back with our Nano Flex 3G fabric, which has a tight knit to block some of the wind, allowing us to avoid a membrane that would inhibit breathability. The fabric is treated with our water-repellent finishes achieved through nanotechnology, so road spray will stay out. The other details are standard functional features from Castelli, including the comfortable KISS Air2 seat pad, mesh bib straps, and Camlock® ankle zippers. You'll get maximum warmth without breaking the bank.