MiiR gives at least 1% of revenue to nonprofit organizations whose work empowers communities while benefiting the health of their natural environments. Thermo 3D ™ Double Wall Vacuum Insulation Technology. No bottle sweat no matter the temperature of your drink. 18/8 medical grade stainless steel. Hardshell™ Powder coat has great color and prevents peeling. Press-fit slide lid - a thoughtfully designed drinkware lid that enhances convenience and performance.