The RILEY PANTS men's thermal base layer is made of a highly breathable material composed of microscopic fibers, quickly removes moisture, is quick-drying and highly breathable. The specialty is the content of silver nanoparticles, which reduce odor. Pleasant flat seams are a matter of course. MIRRA PANTS are made in the EU from 94% polyester and thanks to 6% elastane is flexible and will not restrict your movement.