Ultraflask+ Filter Cap Size:42mm It features a SummitShield ripstop

It features a SummitShield ripstop inner liner for weather-resistance on the inside

360-degree sun protection

and buttery soft

Our Free Range Fleece Vest is a no-frills base layer or cool day warmer

and odor resistance of Merino with the comfort of an interlock knit

Ultraflask+ Filter Cap Size:42mm It features a SummitShield ripstopRun fast, filter faster. The UltraFlask+ Filter Cap threads seamless onto all of HydraPak's 42mm running flasks and handhelds for a lightweight, straightforward filtration solution. Featuring a traditional bite valve and cap design, runners can drink freshly filtered water directly through the high flow Blaster valve.*Effectively removes common waterborne bacteria, such as E. coli (99. 999%) and parasitic cysts (99. 9999%) per HSF 42.