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. Stainless steel. 25 oz. Hand-wash only.