This is the perfect accessory for your tumbler! It protects the bottom from scratching, scuffing, denting, and loud noises. Tumblers are not cheap so why not protect them :) These boots fit (to name a few, message us if you have questions): 20oz-40oz Stanley's 30oz. and 40oz. Simple Modern 24oz. Owala Freesips 40oz. Owala Travel Tumbler 40oz. Swig 20oz,30oz, 35oz, Yeti Ramblers 40oz. Hydrojug Brumate ERA and XL Toddy Disclaimer: Printed designs may appear stretched in certain areas due to the hydro printing technique used. This is normal and expected. Manual measurement, please allow slight variations on size and patterns The color may exist a slight difference due to different screen displays.