PrimaLoft® is a brand of patented thermal insulation material that was developed for the United States Army in the 1980s. Apart from its military usage, Primaloft® insulations can be found in garments from leading sportswear and outerwear brands. And what about the environment? Well, it's a globally respected alternative for goose down (so it's cruelty-free) and the fibres are made from recycled plastic. The insulation that is featured in our latest LT 01 is designed to face (and survive) -60ºC.