Castelli left the days of ill fitting, poorly functioning winter cycling clothing behind long ago, and the brand now takes full advantage of the wonders of modern technology to create clothing that barely resembles its ancestors. The Trasparente 2 Jersey may have evolved over time from various boxy, stiff windbreakers, but you'd barely be able to tell by looking at it. All sleek darting and subtle materials, the jersey provides effective protection in tough cold weather conditions while retaining the impeccable fit and comfort that Castelli is known for.The Trasparente 2 features stretchy Windstopper X Lite panels on the chest and shoulders works to repel rain and block icy blasts of wind without feeling bulky, while Castelli's Warmer fabric is used on the back of the Trasparente to enhance its breathability, facilitating moisture transfer and providing insulation for ride temperatures ranging from 50 64 degrees Fahrenheit. Never neglecting the simple details that make a jersey truly functional, Castelli includes a full YKK Camlock zipper as well as an elastic gripper on the bottom hem of the jersey to hold it in place, while three rear pockets with reflective accents give you space to store ride essentials and help increase your visibility in low light conditions.In terms of fit, expect forward oriented sleeves and an abbreviated fit in the chest compared to similar offerings from other manufacturers. This makes Castelli clothing feel a little tight across the chest while you're standing, but perfectly adapted to your body once you're stretched out on the bike. It sits close to your chest and stomach instead of hanging down, and the more forgiving stretch of Windstopper X Lite means that it moves with you rather than restricting you.