Meal prep is easier than ever with this 2-in-1 bowl set featuring the same Therma-S'well® technology you love that keeps hot foods hot and cold foods cold. The triple-layer, vacuum-insulated exterior bowl and durable Tritan™ inner prep bowl can be used together or separately and are a stylish, sustainable solution for everyday eating. Includes a triple-layer, vacuum-insulated exterior bowl, durable Tritan inner prep bowl and lids Outer bowl is 4 1/2" x 4 1/2"; prep bowl is 3" x 3 1/2" Keeps food cold for 12 hours and hot for 7 hours Outer bowl is condensation-proof, leak-free and dishwasher safe Prep bowl is BPA-free, BPS-free, microwave safe and marked with convenient measurements Outer bowl is 18/8 food-grade stainless steel; prep bowl is Tritan plastic Top-rack dishwasher safe, hand wash recommended Imported S'well is committed to the highest verified standards of social and environmental performance as a Certified B Corporation, supporting programs that seek to protect our environment, empower communities and encourage advocacy through action