The Perka Kerstin 16 oz. double walled 18/8 stainless steel mug appeals to outdoor and indoor lovers alike. The molded cork base protects desktops from scratches and provides an earthy look for camping and its vacuum seal and copper lining helps keep your hot drinks hot for 10 hours and your cold drinks cold for 18 hours. The Kerstin's clear push-in lid with sliding closure is easy to sip from and its curved handle is comfortable to hold and large enough for most hands. It is powder coated for exterior durability and FDA compliant and BPA free. A portion of all proceeds is donated to Shelter to Soldier, a non-profit organization that rescues dogs to train as service animals for veterans in need.