Does it have a filter pocket?

No. It is a plain knit tube with no filter pocket, valve or insert.

Will it stay up over my nose while running?

It has no adjustable closure, so fit depends on head size. Some users find it slips during hard activity.

It works as a light neck warmer and face cover in cool weather. For deep cold, a thicker fleece gaiter is a better choice.

Yes. The thin tube fits under bike and ski helmets without adding bulk at the ears.

Hand or machine wash in cold water and air dry. Avoid high heat, which can shrink or distort knit fabric.

It is a single stretchy tube meant to fit most adults. It is not offered in sized options.

At blacktimbertactical.com, for $26.96, as of our latest check.

2 stores we checked sell it, including Pick Your Plum, blacktimbertactical.com.

$26.96at blacktimbertactical.comChecked 2 h ago

Compared across 2 stores. Prices are checked against each store and labelled with when.

It checks today's price at every store, compares the alternatives and answers in about a minute.