From mountain trails to morning yoga class, our 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 HydroFlask bottle ice cold, sip after sip.

Compatible with all 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
Lifetime Warranty
Great for use with all the Standard Mouth Hydro Flask Insulated Bottles

Hydro Flask Standard Mouth Insulated Sport Cap