YES they do a better job of keeping cold than keeping hot. But easily keep fluids very warm most of a day.
I have a couple, they easily keep coffee soup HOT for all morning in my deer stands at below freezing temps.''
Best part is thee are NOT overpriced for how well they work. NO WHERE NEAR YETI prices!!
CW
https://www.rticcoolers.com/shop/dri...-Tumbler-30-oz