YETI Rambler 20 oz Tumbler, Stainless Steel, Vacuum Insulated with MagSlider Lid https://www.amazon.com/dp/B073WJMKHN/ref=cm_sw_r_cp_api_glt_fabc_TXBR0WG8KYFRHDSZZEH3?psc=1

This is the one I have. Happen to be drinking some right now and I’ll try to take note of exactly how long it stays hot for. Right now I’m sitting at about 45-60 min and it still feels pretty much brand new!