Merrell Women's Natalya Waterproof Strobel construction Waterproof upper Weather-Tight construction Inside zipper 200 gram Opti-Warm insulation Aegis antimicrobial lining Ortholite anatomical footbed Nylon arch stability shank Q-form midsole Heel air cushion Ostalgia Sole Contrast stitches and eye-catching laces make this waterproof boot a pleasure to wear.