
The stainless steel OS Thermal Mug has vacuum insulated walls to ensure drinks hold their temperature, & strengthened seals to ensure it won't leak. Featuring our iconic contour design, it's the perfect partner for a countryside walk. 300ml capacity- enough for a 'large' drink
Size: 65 x 65 x 160mm Expansion chamber with pressure release valve in lid Keeps drinks hot for up to 4 hours or cool for 12 hours Watertight design British Standards for quality & safety