The Calibre Pants are specialist, technical mountaineering pants, designed with a weather-resistant softshell membrane, for use in cold, harsh environments. The new Calibre Pants for Autumn/Winter â15 feature a range of updated unique features, including an updated styling, snow gaiter and ripstop Matrix™ fabric reinforcements in key wear areas. A gripper elastic cuff and under-boot cord loops secure the pants when wearing large mountain boots. The Calibre Pants also feature an updated integrated and removable webbing belt with an offset aluminium buckle. FIT NOTES (Slim Fit) These technical pants are designed with a slim fit to provide greater freedom of movement. A thin baselayer can be worn underneath these pants.