Flexibility And Warmth In A Highly Functional Blend. Istjern Warm Flex Pants Is Designed To Match Higher Activity Levels Such As Winter Hiking And Nordic Cross-Country Skiing. The Pants Feature Two Different Softshell Materials That Are Water-Repellent And Very Flexible. Reinforcements On The Inside Bottom Of The Legs Makes The Pants More Durable And Resistant To Wearing From Hiking And Ski Boots. Inside The Pants You Will Find Soft And Comfortable Fleece Backing In Front And In The Seat. Super Nice And Comfortable In Cold Weather Conditions.