A brilliant highly versatile product that will keep a hot drink hot for up to 4 hours! Designed to be the same size as a large cup of tea this product finds itself used everywhere from the arctic to the golf course. Also great for high mountains when things cool down so quickly! Watertight so can be put into a pack or rucksack.Features● Keeps drinks hot for up to 4 hours or cool for 12 hours● Stainless steel construction with vacuum insulated walls● Expansion chamber with pressure release valve in lid● Sleek watertight design ● Conforms to British Standards for quality and safety