The outdoor gear company Patagonia is concerned that the Trump administration will reverse an order from President Obama designating Bears Ears in Utah as a National Monument.

MediaPost reports that the company is running full-page ads in newspapers in Utah and Montana urging readers to text their support for the 1.35 million-acre area. “President Trump is attacking your public lands,” the ads warn.

“And the company’s president and CEO also fired off a letter to Ryan Zinke, secretary of the Interior, just as he kicks off a tour of national monuments this weekend in the Beehive State,” the report notes.

“The letter to Secretary Zinke objects to the terms of President Trump’s executive order calling for a review of monuments and its 120-day window for deciding if monuments should be shrunk or rescinded,” MediaPost reports, noting that the letter calls the oreder “absurd.”

“Given the unique and complex histories of each monument, there is simply no way to meaningfully review dozens of individual monuments in such a short period,” the letter states. The letter is signed by Yvon Chouinard, Patagonia’s founder, and Rose Marcario, president and CEO.