The Base Camp Waterproof Mules are part of our new Base Camp line of everyday footwear. They’re waterproof, comfortable and protective with Vibram® XS Trek outsoles. Plus, the THERMOBALL™ synthetic insulation helps keep your feet warm even in wet weather. Our waterproof footwear incorporates a variety of advanced waterproofing materials, treatments, and processes. To help keep feet dry, we use internal waterproof membranes and/or adhesive and seam-seal constructions.