The Climatic Research Laboratory (CRL) was a U.S. Army military clothing and equipment test site formerly located at Lawrence, Massachusetts from 1943 to 1954. The lab tested textile and insulating materials and was capable of simulating climatic conditions throughout the world (e.g., desert, rain forest, tundra, mountain). A "Jungle Room" was maintained for thermal physiological testing on human volunteers. Field trials were conducted by the lab at sites such as the Dolly Copp Test Site at the foot of Mount Washington, New Hampshire.