The Explore sock is a light weight sock that is the perfect "do everything" alpaca socks. It is very similar to the Prevail line using the same yarn and construction. The Explore 6" crew is a perfect sock for hiking shoes or lower hiking boots for any summer activity. The Micro is a no show sock for running or biking. Whether you are out hiking, mountain biking, walking or using them for everyday use, the Altera Alpaca Explore is the perfect summer sock.Altera High Performance Fiber Technology is naturally anti-microbial and flame resistant. Altera enhances the antibacterial properties of the alpaca fiber with an exclusive Silver Infusion Technology, enabling multiple odor-free wears of our alpaca garments without laundering. The Explore sock is constructed with a reinforced heel and toe and arch support.On a microscopic level, alpaca fleece has a smooth exterior surface, which is why alpaca is as soft as silk. Alpaca features an unique hollow core which allows it to wick moisture away from your skin Alpaca fiber provides up to 30% greater insulation that Merino wool in either hot or cold conditions. Total thermal regulation even when wet!The Explore Sock is made in the US.45% Alpaca34% Hydrotec15% Nylon/Lycra1% SilverEasy Care: Machine wash/ no bleach. Tumbler dry low heat or hang dry. Turn inside out for best results.The Explore Crew come in two colors: Sage Tweed and Sage Brown.Available sizes Medium 5-9, Large 9-12 and X-Large 12-14.