They follow in the footsteps of REI workers in New York City who formed a union earlier this year.
The event, "A New Labor Movement," delved into the wave of union organizing that has come to high-profile employers this year.
Check out the deals on camping and hiking gear, apparel, accessories and more.
Tune in on July 20 to watch our panel discussion with union organizers from the Amazon, REI, Starbucks and Apple battles.
Come join HuffPost for a panel discussion in New York City with workers from these companies, or tune in for our livestream on July 20.
None of the outdoor retailer’s locations were organized until now.
Corporations like Dick’s Sporting Goods, REI, Kroger, Walmart and L.L. Bean are tightening restrictions on firearm sales in the wake of the shooting at Marjory Stoneman Douglas High School in Parkland, Florida.
"It is the job of companies that manufacture and sell guns and ammunition to work towards common sense solutions," REI said.
The retailers are taking a stand against President Trump's decision to drastically shrink two national monuments.