Assos thrives on engineering performance wear for cycling, which is tuned for every condition you may encounter season after season. In the new Mille GT Ultraz Winter Bib Tight, Assos gracefully threads the fabrics between a heavily-insulated assault on winter and the lighter-weight performance insulation you need to excel on critical training rides. In the regular-fitting GT Ultraz, you’ll find a water-resistant front and glute membrane made of Assos’ NEOS Ultra — that is also 100% windproof — to protect from rain-soaked valleys, and snow flurried mountains. Front-facing RX Heavy thermal fabric rests against your thighs and glutes to keep your major muscle-groups warm and performance-ready, while the rear legs and calves receive RX Light insulation to allow for heat loss when you hit the intervals and need to stay cooler.

Assos pre-shapes their fabrics, so when you are in or out of the saddle, you’ll have supported muscles and the ideal range of motion without stitch-pulling or limiting stretch at the knees. A Mille GT EVO chamois that uses 3D waffle patterning for breathability is stitched into the GT Ultraz using performance threads that allow for 3D movement. At 8mm of thickness, the chamois performs during long winter base miles without adding bulk. For low-light riding, the calves have a wrapped reflective stripe to add visibility.