The MILLE GT Ultraz Winter Bibs are constructed with an arsenal of winterproof textiles to deliver unmatched levels of insulation, breathability, and weather resistance. With double-layer protection throughout and a membrane-backed front panel, the Ultraz stand in as the most protective bib tights in our regularFit platform. We began with the same highly insulating brushed-back RX Heavy that's used in our Winter Bib Tights, but added a second layer on the outside for added protection. For this twinDeck construction, we applied our NEOS Ultra textile-an ultrathin 2L softshell with PU bonded membrane that's water-resistant and 100% windproof-to ensure this element-facing section of your legs and glutes remains protected from snow, rain, wind, and low temperatures. As with the Winter Bib Tights, RX Light makes up the backs of the legs for added breathability and comfort in this high-flex zone. The fit of the Ultraz falls into our regularFit category, which means they're lightly compressive with their double-layer design, but not as tight as our racingFit apparel. The fabric panels flex with each pedal stroke, as they're both pre-shaped and sewn to fully wrap and support the upper leg muscles, knees, and calves while in motion. The insert is our proven MILLE Winter Insert, cleverly sewn with reversed seams into the RX layer only, yielding the smoothest possible feel against your skin.