Trying to choose between a heavy jacket and your standard cool weather jersey and warmers combo gets old fast, especially after you've chosen incorrectly a few times and wound up with stiff, frozen arms or spent an entire ride soggy and overprepared. Rather than trust your own weather assessments, brave the volatile shoulder seasons in Castelli's Gabba 2 Short Sleeve Men's Jersey. It's designed to be worn with Castelli's Nanoflex Arm Warmers when the weather takes a turn for the worse, and strikes a versatile balance between breathable and warm in windy and wet conditions. To strike said balance, Castelli crafts the Gabba 2 using Windstopper X Lite fabric, a lightweight, breathable synthetic engineered to block icy gusts while still allowing sweat to evaporate at its surface so you stay cool. It's also treated with a water repellent finish so that surprise rain showers don't leave you saturated, and Nano Flex inserts along the underarms add ventilation and breathability to a more sweat prone area. According to Castelli, the Gabba 2 works best in temperatures ranging from 50 to 64 degrees Fahrenheit, but your comfort will ultimately depend on how hard you're riding and how you choose to layer. Castelli wanted its prized Gabba series bearing no resemblance to ill fitting jackets and billowing windbreakers of the past, so it gave the Gabba 2 the same contoured, minimalistic aesthetic that's earned the rest of its kit such a devout following. Don't be alarmed to find the Gabba 2 fitting tight across the chest and shoulders when you're standing up Castelli does this on purpose to guarantee its kit follows your body position perfectly once you're in the saddle. A silicone gripper secures the bottom hem in place while you ride, and the three rear pockets come with mesh drains to keep water out when you brave the rain.