Zimmerli Zimmerli - Zimmerli has been making 'the world's finest underwear' since 1871 and this white Pure Comfort T-shirt is a prime example of its elevated offering. It's crafted in Switzerland, a country renowned for its focus on design and quality, from an astoundingly soft and lightweight blend marrying fine Pima cotton with a high component of elastane, then finished with a V neck above a form-fitting silhouette.