The Oasis S/S Insulated Thermal Sports Bottle Screw Cap 780ML features double-wall vacuum insulation to keep drinks cold for up to 12 hours (some retailers suggest up to 24 hours for cold, and 8-12 for hot), a fast-pour screw cap spout, and durable stainless steel construction. According to various retailers’ information, handwashing is recommended for this bottle to maintain its finish and insulation properties.