Answer My MH Piero pants, which I purchased one year ago, are abrasion resistant nylon with a polyester waist band. These are not heavy insulated pants intended for winter sports. These pants are medium weight and do appear to be nearly indestructible. I wear MH Rifugio stretch climbing pants for warm weather outdoor activities. If you are looking for fully lined pants check out MH Warlow soft shell pants. Marmot also makes Tarn soft shell pants for winter sports. Both the Warlow pants and the Tarn pants are available from STP at a great price.