Stanley is recalling 2.6 million mugs sold in the U.S. after the company received dozens of consumer complaints, including some users who reported getting burned and requiring medical attention.

The recall covers all Stanley Switchback and Trigger Action stainless steel travel mugs, which are double-walled mugs sold in a number of colors and sizes that came with a polypropylene lid, according to the recall notice posted Thursday by the Consumer Safety Product Commission. The Stanley logo, a winged bear with a crown, appears on the front and bottom of the mug.

The company has received 91 reports worldwide about the lids coming loose while in use, leading to 38 burn injuries. The CSPC said 16 of the complaints stemmed from U.S. consumers, including 2 burn injuries.

“Consumers should immediately stop using the recalled travel mugs and contact Stanley to receive a free replacement lid, including shipping,” the CSPC said in its statement.