Packable, breathable, low-bulk insulation for layering under waders in cold conditions. So comfortable and warm (even if wet) you'll still be wearing them long after your waders are hung up to dry. Shell: 1.45-oz 100% polyester with a DWR (durable water repellent) finish. Seat reinforcement: 3.4-oz 100% nylon taslan with a DWR finish. Insulation: 60-g PrimaLoft® Silver Insulation.