Compatible with all Hydro Flask Standard Mouth bottles, this insulated sports cap makes drinking on the go easy. The insulated design provides enhanced temperature protection, so your ice cold water stays that way, sip after sip.
- Insulated sports cap
- Insulated for enhanced temperature protection
- Quiet "no whistle" valve
- Compatible with all Hydro Flask Standard Mouth bottles
- BPA and Phthalate free
Mouth diameter: 4.9cm