Haven Well Within. A thoughtful collection of lounge, sleep, home, and lifestyle essentials — and your trusted resource for all things wellbeing. Unwind in the soft, easy comfort of these inviting sleep pants. Made from TENCEL™ Modal fibers, they're smooth, stretchy, and soothing — for a restful night's sleep. TENCEL™ Modal fibers are mainly manufactured from beech wood, sourced from sustainable forests in Austria and neighboring countries. Beech wood forests are a natural and renewable source of raw material. A big share of the wood used at the Lenzing site comes from Austria, harvested from certified and controlled sources following the stringent guidelines of the Lenzing Wood and Pulp Policy. Moreover, wood and pulp used by the Lenzing Group comes from sustainably managed forests. TENCEL™ Modal fibers have earned United States Department of Agriculture (USDA) BioPreferred® designation.