①. QUALITY & DURABILITY: This vacuum coffee mug is made of durable 18/8 premium stainless steel (inside and outside), with a food - grade polypropylene (PP) lid. It is BPA - free, environmentally friendly, durable and can withstand the demands of everyday use. ②. STYLISH DESIGN: Compact and lightweight, it fits most cup holders. The silicone textured surface band makes this mug easy to grip. The non - slip base prevents the coffee mug from slipping or tipping over. The wide opening makes it easy to clean and add ice cubes, and bacteria are less likely to breed. ③. Leak - proof lid: The silicone sealing ring on the lid ensures a leak - proof seal. It opens through a small hole for easy drinking. One - button operation helps prevent accidental leakage or spillage. ④. LONG - LASTING HEAT AND COLD RETAINING: Double - wall construction helps with temperature retention, keeping your drink hot/iced for hours. Pour hot or iced coffee into the vacuum coffee mug to feel energized throughout the day. ⑤. GREAT GIFTS: This reusable coffee mug can be given to your loved ones, friends and family as a nice gift for birthdays, Thanksgiving, Christmas, Valentine's Day.