The Simms Midweight Core Bottom is designed to keep your body warm in freezing temperatures. Made from 100% polyester (243 gsm) with a brushed interior, it offers optimum warmth while remaining lightweight. Its anti-odor, moisture-wicking fabric keeps your skin dry and comfortable, even during intense activity. The jacquard elastic waistband and elastic cuffed ankles ensure a perfect fit under your waders or wetsuits. Flat seams guarantee chafe-free comfort, even after long hours of wear. These thermal pants are the essential accessory for all your cold-water outings.