3 Ply Insulation: S'well Tumbler Calacatta Gold 510ml Stainless Steel Tumblers feature 3-layer vacuum insulated construction, designed to keep drinks cold or hot for longer. Each mug features unique colours, prints, patterns and textures while providing excellent functionality. Transparent lid for opening the drinking glass is included. The mug can only be hand washed while the lid is dishwasher safe. PERFECT FIT - Our metal drink containers are designed with a wide mouth and a thin rim for easy drinking and adding ice cubes so you can refill and reuse them over and over again. The transparent airtight lid helps keep your drinks cold or hot for longer, while the smooth sliding mechanism allows for easy drinking. Whether you're going to a meeting or picnic, you will find that the cup holds your favourite drinks just right. Sustainability without compromise: you don't have to compromise to live sustainably with our elegant, beautifully crafted tumblers. As a certified B-Corp, we proudly maintain the highest levels of certified social and environmental performance, transparency and responsibility. International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.