When the mercury climbs and you're grinding up a mountain pass, the limiting factor often isn't fitness—it's heat management. The Mechanism Pro Zipless Jersey from Pas Normal Studios addresses this directly by eliminating the zipper entirely and building the garment from a proprietary knitted fabric that prioritizes ventilation over everything else. The result is a jersey designed to feel like it's barely there during the hottest climbing days of the season.

The fabric is the defining feature here. Pas Normal Studios developed a unique knit structure produced in Italy, using 65% polyamide and 35% elastane. The high elastane content creates a construction that stretches and conforms to the body rather than sitting on top of it, and the knit structure leaves channels for heat to escape directly through the fabric as you move. This isn't about wicking moisture after you've overheated—it's about preventing the buildup in the first place by letting your body's cooling system work unobstructed.

The zipless design accomplishes several things simultaneously. Removing the zipper eliminates weight, removes a potential hot spot and source of chafing, and creates a cleaner aerodynamic silhouette. The low-cut collar and laser-cut edges reduce bulk further. Three rear pockets made from the same elastic material hold essentials without overstretch, even when loaded with gels, a phone, and a compact layer for descents. The fit is tight and race-oriented—this is Pro-level kit positioned for riders who prioritize performance over casual comfort.... Read More