The Ocean Bottle Tumbler has double wall insulation to keep drinks hot for up to four hours and cold for up to ten hours. It fits seamlessly under most coffee machines, as well as in most car cup holders. Each travel mug is entirely carbon neutral and collects 1,000 plastic bottles to improve livelihoods in coastal communities. The tumbler is made from 90% recycled stainless steel and other recycled materials. Presented in a responsibly sourced recycled cardboard gift box. 350ml.