Here's how it works: the space between the inner and outer flask wall is evacuated, creating a vacuum (well, a partial vacuum anyway...). In order for heat transfer to take place from the outside world into your cold drink, or from your hot drink to the outside world, it needs nearby molecules to excite. If there aren't many molecules nearby, as is the case in a vacuum, the heat's energy can't easily be passed along, so your drink stays close to the temperature it was when you put it into the flask for a really long time. 

Simply stated, vacuums make great thermal insulation!

If you live in the UK, EFTA, or anywhere outside of the EU, taxes and import fees may be due upon delivery.

For orders shipping to North America, use our USA website for quicker transit times and more affordable shipping costs.

Delivery to zip codes that UPS considers to be "Remote" are charged the UPS Extended Service area fee of €30 in addition to the standard shipping rates.

Orders are processed within 1-3 days (Monday-Friday)
Shipping by GLS & UPS 1-5 days

Please double check your shipping address before submitting your order. We are unable to update your address or cancel you order prior to shipping once it is in our system. If your package is returned to us due to an incorrect address or refused delivery, we will refund the cost of the items less a 20% restocking fee if the goods are still in saleable condition. Shipping costs are non-refundable.

To start a return please contact us using the contact form. Returns must be made within 30 days of placing your order.