Full softshell jackets can be the best option for cool weather cycling when conditions are mostly dry thanks to the wind blocking capability, excellent breathability and mild rain and splash protection. The Go Jacket is Castelli's most versatile such piece. It can be used as a light shell in mild conditions protect in cold conditions by adding insulating layers underneath. Stretchy, comfortable, breathable, windproof, water resistant, elegant, and lightweight, this jacket has it all.

If you're looking for just one jacket to do it all, start here. The design team at Castelli used the company's lightest GORE-TEX INFINIUM™ WINDSTOPPER® three-layer stretch fabric, which makes it great for milder conditions, and the stretch gives it a great fit. It's the same outer fabric as Castelli uses for their Alpha RoS 2 Jacket, considered the protection and light thermal jacket that sets the standard for how cool to cold weather jackets should perform. The Go Jacket is more versatile, as it forgoes the Alpha's integrated liner so you can decide how much insulation you need. Add a Flanders Warm base layer and thermal jersey to extend the comfort range to subfreezing temperatures. But the fabric is only the start.

The designers have tailored the fit to be close to body but not too close. It gives a good drape to the jacket, rounded out by details like the no-sew finishing to the hem and the zippered colored chest pocket. The hidden internal cuffs are a nice comfort touch, and you'll appreciate how they eliminate drafts from the wrist. An easy to manipulate with gloves YKK Vislon zipper with a rubberized pull keeps you in control of manual ventilation. There are three pockets on the back, with a large reflective strip stretching across the entire bottom of the pockets for nighttime visibility. When buying a great shoulder season cycling jacket that can effectively perform and extend further into the cold with proper layering, the Go Jacket is great choice.