Arc'teryx high-performance base layer, the "RHO Hybrid Crew," in gray, size M. Brand new, unused. 2023 model. Purchased during a trip to the United States. The RHO Hybrid is an evolution of the model previously sold under the name "Motus AR." It uses a proprietary fabric (Phasic) that is soft, stretchy, and excellent at wicking away sweat and drying quickly, making it suitable for trail running and mountaineering in harsh winter conditions. The RHO Hybrid features merino wool under the arms, improving breathability. Highly regarded by serious trail runners and mountaineers with a long history of using Arc'teryx products, this item was niche enough that it was extremely limited in distribution domestically, with black and gray colors being difficult to obtain. Incidentally, the combination of different materials made it expensive, and it was likely discontinued after about a year. The same material is sold as the Cormac Heavy, but it has a looser fit, making it less practical as a base layer for active use. Price negotiations are not accepted. Returns are not accepted. Only those who understand this, please.