Imitating the charm of raw materials and natural fibers that can be found in the world's most picturesque forests, the Wood Collection, featured in a smooth matte finish, resembles mixed distressed woods. S'well bottles feature Therma-S'well(R) Technology with triple-layered, vacuum-insulated construction designed to keep beverages colder or hotter, longer than all the rest. Made from 18/8, food-grade stainless steel with superior construction that allows for refilling and reusing easily to reduce the need for single-use plastic water bottles. Copper wall layer creates a condensation-free exterior that won't sweat on your hands or in your bag. The 9oz is perfect for on-the-go; fits snugly inside hand-bags and lunch-bags. Keeps beverages cold for 27 hours and hot for 12. The 17oz emulates a standard size water bottle, and is perfect for staying hydrated at the gym or on-the-go. Keeps beverages cold for 41 and hot for 18. The 25oz is perfect for staying hydrated on-the-go. Fun fact: it holds an entire bottle of wine. Keeps beverages cold for 54 hours and hot for 26. Bottle mouths fit most ice cubes, while the body fits most cup holders. BPA/BPS-Free and reusable. Hand-wash only.