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 Hydro Flask bottle ice cold, sip after sip.
Features • 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
