Double Wall Construction for Hot and Cold Drinks: Double layered glass mug insulates your drink keeping it hot or cold longer while the outside stays comfortable to your touch allowing you to embrace your drink while you sip at your drink's ideal temperature. Standard: For the coffee maker. Our drafted vessel cups ensure the perfect pour, and fit under coffee machine group heads, keeping extraction and crema intact. High-quality FDA Food Grade Tested Silicone: Silicone Seal to prevent any leaking while drinking. Silicone sleeve to ensure a non-slip grip. Specification: Material: Glass + Silicone. Colour: Grey. Size: 17x0 cm. Capacity: 500ml. In Package: 2 Piece Travel Mug with Non-Slip Sleeve and with Lid.