Spinning in place on a training app turns up the heat fast, and the Assos MILLE GT Indoor Bib Short S11 answers it with ventilation in every panel. Durable QUARTZ fabric covers the high-contact areas, while open-structure POLSTAR mesh wraps the legs and pushes moisture to the surface, where it evaporates quickly. Perforated mesh straps add airflow across the upper body, and these indoor cycling bib shorts also suit hot summer rides outside, with Assos recommending sunscreen under the ultralight leg panels. What Our Gearhead(R) Experts Are Saying:"Trainer sessions kept me in one spot on the saddle for the whole workout, and that is where the heat builds. The vented front panel and perforated pad let air reach that spot, so I held hard intervals through to the cooldown comfortably."