Borosilicate Glass + Silicone | CREATED FOR MOST CAR CUP HOLDERS-Glass cups with lids and straws specially developed for car cup holders. Perfect size designed to hold 40oz of hot tea and iced coffee. The glass tumbler can be safely placed in most car cup holders. | EARTH-FRIENDLY DURABILITY: Constructed of 100% recycled BPA free and thicker borosilicate glass for sustainable sipping, our BLUEGO glass tumblers has the durability to stand up to a long lifetime of using. Eliminate the use of single-use plastic bottles with a travel tumbler built with sustainability in mind. | TIME MARKERS: Wide mouth iced coffee cups come with time markers, helping you to track your daily water intake and reminding you when to take your next sip. With the help of the time reminder, you will stay hydrated and drink enough water throughout the day. | MULTI OCCASIONS & GIFTABLE- BLUEGO coffee mug with handle and straws, a wonderful companion for you both indoor and outdoor, ideal for home, office, car, school, camping, picnic, climbing,travel, etc. The tumbler glass is also a perfect gift for your family members, friends, colleagues, other loved ones on special days, like Christmas, Thanksgiving, New Year, Valentine’s Day, birthday, mother’s day, father’s day, etc. | DISHWASHER SAFE: Spend less time hunched over the sink and more time doing the things you love. Cleaning your tumbler and lid couldn't be easier, just pop them into the dishwasher. Unlike plastic bottles that retain stains & smells, this glass beauty comes out pristine.