The Primus Merino socks use a superior Merino wool blend from Schoeller. They’re Superwash treated so that they stay soft longer and maximize the natural anti-odor functions of the Merino wool. Trapped against your skin, perspiration can leave you chilled or damp no matter how well your boots fend off snow and rain. For optimal comfort outdoors, your socks should be made of merino wool. Rather than absorbing moisture, merino wool transports (or wicks) perspiration away from your skin and disperses it on the outer surface where it can evaporate. The result: you stay drier even when you sweat, and your sock dries quickly afterwards.