Our HydroSoul tumblers are made of double-walled stainless steel and are vacuum insulated for maximum temperature control. These tumblers can hold ice for up to 24 hours, these tumblers are at the height of drinkware. The Zen Cup (350ml) is an on-the-go essential for any busy lifestyle. Crafted from food grade stainless steel and BPA free, each Zen Cup is individually gift boxed in a natural craft box. Additionally, the Zen Cup offers brilliant mirror finish branding option for your brand.