Mammut made the Men's Aconcagua ML Tight durable and performance-oriented for extreme mountaineering missions. It's composed of a sophisticated combination of two high-quality, functional fleeces that promote proper body climate in high altitudes. The main fabric is Polartec's Power Stretch Pro fleece for excellent moisture management properties as well as freedom of movement. Polartec's fleece also has an abrasion-proof nylon exterior for long-lasting durability. Pontetorto Tecnostretch is the second fleece, and it covers the crotch and lower leg to enhance mobility on the mountain. Pontetorto includes a waffle texture on the inside to drastically increase the tight's moisture-wicking potential.