Power pants. The Mason is a high rise pant with a relaxed, wide leg. It features front, double tucks and a button closure on the waist. A versatile staple in your wardrobe. Sizing details in image This is a lightweight woven suiting fabric - 100% TENCEL™ Lyocell. Hand wash + dry flat. TENCEL™ Lyocell comes from Eucalyptus trees, which take only half an acre to produce one ton of fiber. Its closed loop production means 99% of the non-toxic solvent is reused.