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.
- Compatible with all Hydro Flask Standard Mouth bottles
- Insulated for enhanced temperature protection
- Quiet, "no whistle" valve
- BPA-Free and Phthalate-Free
- Sport Cap is not intended for use with hot liquids and is not leakproof
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