Premium full grain and nubuck upper is waterproof and seam-sealed to the injection molded rubber lug outsole to keep feet dry. 4 Rows of nylon stitching in the upper resist rot and prevent stress. PrimaLoft ECO insulation in the interior is made from 50% PET (made from recycled plastic bottles) to insulate feet and retain warmth even when wet. Padded leather collar hugs the ankle while and 100% recycled nylon Taslan laces stay tied for a perfect fit. Hexagonal brass eyelets are rustproof for years of solid wear.