The Home of the Free Because of the Brave 12oz travel tumbler is double-walled vacuum insulated, stainless steel. Keep hot drinks hot and ice cold drinks cold longer & more efficiently than most other tumblers! The "why" of this tumbler is because I come from a LEO family and I know many military families. These brave men and women deserve more than just a simple thank you. They deserve our respect & gratitude for continually making America great. This tumbler is dedicated to all our family, friends & loved ones who are serving, have served or are currently in harm's way defending our country.