Safe for Hot/Cold Liquids. Non Slip Base. Leak Proof Lid. Our 30 oz USA Printed double wall insulated mug is safe for both hot and cold liquids and has a stainless steel outer shell with a plastic liner. These can keep drinks hot or cold for an extended period of time. WE CAN PRINT ANY PMS COLOR AND FULL COLOR NOW AVAILABLE. Add a personal touch by inquiring about personalization. Ask about getting unique names printed on each of these mugs. WE DO OFFER PERSONALIZATION. Have a special request? Ramblers or chatterers know we can meet the demand of your customers. These are perfect for sports games, colleges, yetis, and more.