Looking for a perfect 24oz, all-day hydration, insulated liquid container that will keep your tasty beverage cold or hot for extra-long hours. Are you also looking for the purest refreshment that will be "good to the last sip" guaranteed, then HydraPeak Flow is your #1 choice. HYDRAPEAK Flow water bottles are constructed from the outside with stainless-steel, while inner is double vacuumed insulated with a layer of copper to reduce the transfer of temperature, doubling your insulation.