Leak-proof lid when closed for on-the-go convenience. Stainless steel double-wall vacuum insulation keeps liquids hot up to 6 hours or cold up to 12. One-handed drinking with no lids or caps to remove or misplace. Reusable travel mug fits most cup holders and under most single-serve brewers. Top rack dishwasher-safe lid, handwash body. 16 oz.