Dry winter days are often the ones that make us feel the guiltiest for not being out on our bikes; clear skies, bare roads, and sun bring far fewer challenges than messy, wet days do. If you're thinking about training through the winter (whether for a spring goal race or because you're tired of staring at your basement wall on the trainer for 3 months) the Castelli Men's Mortirolo 4 Jacket makes an excellent investment in dry-day comfort. Lightweight and warm, the Mortirolo doesn't come with as much protection from wind and rain as siblings like the Senza or Espresso, but what it lacks in weatherproofing, it makes up for in lightness. Cut with a slim silhouette, the Mortirolo 4 was bred for versatility; it's meant to be just as comfortable during a tough set of intervals as it is during a tempo ride or endurance-building base miles. Though not as contoured as Castelli's race kit, the Mortirolo easily accommodates a baselayer without ever appearing, or feeling, sloppy in the saddle. A Gore Windstopper X-Fast front panel does shield against rain and wind, while Castelli's thermal Warmer fabric, aptly named, covers the back of the jacket. It provides ample stretch and breathability to help you avoid overheating on cold days with warm sun, especially as you tackle hard efforts. Zippered vents along the chest further improve the jacket's ventilation, while a silicone waist gripper holds the drop hem in place as you stretch out into your drops.

• Material: [front] Gore Windstopper X-Fast, [back] Warmer
• Fit: slim
• Length: hip
• Venting: zippered front vents
• Pockets: 3 rear

Material: [front] Gore Windstopper X-Fast, [back] WarmerCastelli