HYDRO FLASK wide-mouth bottles feature TempShield double-wall vacuum insulation to keep drinks cold for up to 24 hours. Constructed from durable stainless steel for pure taste with no flavor transfer, each bottle is equipped with a leakproof Flex Straw Cap for easy, one-handed sipping. The wide-mouth design is ice-cube friendly and makes filling and cleaning straightforward. BPA-free and built for outdoor and sports use, these bottles offer reliable insulated hydration and include the Flex Straw Cap as part of the product family.