Tumbler Hydra Go

This tumbler is made of stainless steel with a plastic lid, reusable straw, cleaning brush, and double-walled insulation to keep drinks cold for up to 8 hours or hot for up to 6 hours. It is suitable for gym, office, car, or outdoor activities.

• The description claims that it keeps drinks cold for up to 8 hours or hot for up to 6 hours.