The last word in cold-weather cycling.
When gearing up for cold-weather cycling, we typically accept that things like fit comfort and aerodynamics will be sacrificed in favor of wind-stopping power and warmth. Leave it to Castelli to refuse this sacrifice with the Sanremo 2 Thermosuit, a piece of kit designed to offer the aerodynamic benefits of a bulk-free fit without the restriction of bibs — all while preserving the benefits you'd expect from the company's flagship cold-weather technology.
The Sanremo 2 uses a mix of fabric panels in strategic locations to create a microclimate in the sliver of space between your skin and the Thermosuit. The Windstopper X-Lite fabric leads the charge on the upper portion, offering 1.4 billion impossibly small pores per square inch that guard your microclimate jealously. They don't let wind in, but they do let moisture and water vapor out. This isn't just based on vague marketing copy, though. The science behind Windstopper X-Lite is measurable in a rating called CFM, which stands for cubic feet per minute, used to measure the volume of air that passes through a fabric in, you guessed it, one minute. In order to be considered truly "windproof," a fabric must register a CFM of equal to or less than 1.0. The Windstopper X-Lite fabric actually beats this rating, so you're guaranteed a literally windproof top.
The bottom portion is a mix of Thermoflex and Thermoflex Core2, using the former for areas that need more stretch and the latter in areas that need more protection. Both iterations of Thermoflex use hollow-core yarn to increase the size and insulating power of that thin microclimate. The whole Thermosuit is water-resistant and lined with a brushed interior so it's comfortable against your skin without any need of a mediating base layer.
The fit is the same bulk-free, race-worthy fit you'd enjoy wearing Castelli's Gabba Long-Sleeve Jersey and Sorpasso Bib Tights, less two elements: The bibs and the gaps. We often find that cold-weather bibs are unduly constrictive in cold-weather bottoms because of their focus on insulation rather than flexibility, so doing away with them is a plus, and the fact that the Sanremo 2 is a suit means that there are no unfortunate gaps in coverage at the waist. The sleeves are forward-oriented, so the Thermosuit feels a little tight across the chest while you're standing, but it relaxes into a comfortable fit while you're stretched out on your bike. Add to this the Progetto X2 Air chamois, and you've got what may amount to the most comfortable cold-weather cycling outfit date. You may actually regret going back to your summer kit.
A few thoughtful details round out the Sanremo 2: the underarms offer increased ventilation, the collar is articulated to eliminate looseness in the saddle, there are three rear pockets in the top, the front zipper overlaps, the ankle zippers tighten down for a secure fit over your shoe covers, and both the top and bottom have reflective tape to increase your visibility to motorists in low-light conditions.
The recommended low-end thermometer rating for the Sanremo 2 has dropped four degrees Fahrenheit compared to its predecessor, from 41 to 37, while the top end remained at a generous 59. We say generous, because we feel that the Sanremo 2 starts getting too toasty for conditions above 55 degrees and sunny.
The Castelli Sanremo 2 Thermosuit is available in six sizes ranging from Small to XXX-Large and in the colors Black/yellow fluo or Drive Blue/black/white.