From mountain trails to morning yoga class, The Standard Mouth Insulated Sport Cap lets you hydrate one-handed and on the fly. It’s the first insulated sport cap specifically designed to keep water in your Hydro Flask bottle ice cold, sip after sip.
Please note: This lid is not leak proof.
- Compatible with all Standard Mouth bottles
- Insulated for enhanced temperature protection
- Quiet, "no whistle" valve
- BPA-Free and Phthalate-Free