We've arrived at the most difficult time of year, with blustery mornings giving way to clear, brisk afternoons and making layering decisions nigh impossible to find the perfect balance between over- and under-dressed. Enter Louis Garneau and its Men's Spire Convertible Cycling Jacket, blending cooling breathability and wind-resistant warmth to comfortably weather breezy fall mornings and early winter chill. When it warms up a bit more than expected, removable sleeves quickly detach and stow stealthily in a rear pocket so you can get to work on honing next year's razor sharp tan lines. Louis Garneau constructs this jacket using its Polartec Power Shield Pro material, featuring a three-ply construction with soft polyester sandwiching a polyurethane membrane and a water-repelling DWR surface treatment. This material isn't completely wind proof, but makes up for that small concession with significantly increased breathability compared to its wind proof compatriots. What little wind it does let through is said to channel into increased ventilation and faster drying, which means increased overall microclimate control. Strategically placed panels of soft, breathable Vertexx fabric serve to boost the Spire's breathability, further increasing comfort and minimizing clamminess during higher intensity efforts.