New without tags Arc’teryx Rho Hybrid 1/2 Zip Neck Mens Base Layer Color Edziza Size Medium A performance base layer for active adventure in cold weather, the Rho Hybrid’s Phasic™ AR II material stretches, provides thermal comfort, and is made with wicking fibres. Merino wool panels are placed in high-odour areas – something that’s appreciated on multiday trips – the deep front zipper ventilates, and the streamlined fit layers easily and is patterned for maximum mobility.