From mountain trails to morning yoga classes, our Standard Mouth Insulated Sport Cap makes all your adventures better. It's the first insulated sport cap specifically designed to keep the ice water in your Hydro Flask bottle cold, sip after sip. Plus, the unique design lets you hydrate one-handed, whether you're checking out wild flowers in the wilderness or showing off your warrior pose in the gym.
- Compatible with all Standard Mouth Hydro Flask bottles
- Insulated for enhanced temperature protection
- Quiet, "no whistle" valve
- BPA-Free and Phthalate-Free