Specs: Compatible with 24 oz or 32 oz mug Features: Keeps heat and cold contained while lessening beverage splashes It fits 24oz mug, 28 oz tumbler Easy-to-use design Wide enough opening for drinking and reusable straws BPA- and toxin-free for safe usage Can be washed in dishwasher. Do not use bleach or chlorine cleansers. Wash before first use Not intended for use on stove, in a microwave or freezer.