The Timberland Men's Earthkeepers Chillberg Mid Insulated Waterproof Boot has a ton going on on the surface and under it. The surface is premium full grain leather that handles rough summits and looks smart on your local trails. Underneath, there's a waterproof membrane to keep out moisture, and there's 200g PrimaLoft insulation, which keeps active feet warm. The PET lining, made of 100% recycled plastic bottles, is comfortable, breathable, and eco conscious. A fully gusseted tongue provides comfort and keeps out debris. To make this boot every day comfortable, there's a shock absorbing EVA midsole for cushioning. The lug outsole, Green rubber made of 42% recycled rubber, is built for traction over roots, rocks, and icy pavements.