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The New Mountain Standard
Meet the Cast Iron Sierra Pants, built for the mountain town, the wild places, and all the spaces in-between. The Sierras combine the everyday comfort of jeans with the ruggedness of our signature Cast Iron fabric. Designed to bend, but not break with an active, 4-way stretch, the Sierras move with you—whether on a pre-dawn scramble, mid-day siesta, or late-night bonfire beers. Put on the new mountain standard, one leg at a time.
  • 11 oz 
  • 84% Cotton, 14% Cordura Nylon®, 2% Polyurethane
  • 4 Way Stretch
  • Fully articulated leg shape
  • Triple needle construction
  • Two layer utility patch pockets left hip
  • Quick draw phone pocket on right hip
  • Crotch gusset for freedom of movement 
  • Curved waistband
  • Bar tack reinforcements at stress points
  • Imported
  • Straight through the thigh, hip and seat with a gradual taper from the knee down. View a detailed measurement chart here.


    Built to bend and not break, The Sierras are rugged and flexible. Engineered with four way stretch for a full range of motion and reinforced with triple needle construction and heavy duty bar tacks at stress points.


    Our signature Cast Iron Fabric combines the strength of Cordura® nylon and the classic feel of cotton with the comfort of stretch. Cast Iron Fabric was developed in 2015 to provide a technical, durable and comfortable alternative to big box workwear. It has been the trusted choice of guides, growers, craftsmen and adventure enthusiasts around the world ever since.